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Tea is an aromatic beverage prepared by pouring hot or boiling water over cured or fresh leaves of '' Camellia sinensis'', an
evergreen In botany, an evergreen is a plant which has foliage that remains green and functional through more than one growing season. This also pertains to plants that retain their foliage only in warm climates, and contrasts with deciduous plants, whic ...
shrub native to East Asia which probably originated in the borderlands of southwestern China and northern Myanmar. Tea is also rarely made from the leaves of ''
Camellia taliensis ''Camellia taliensis'' (also known as Yunnan large leaf varietal tea, wild tea, Dali tea, Yunnan broad tea, and others; 大理茶) is a species of evergreen shrub or small tree whose leaves and leaf buds are used to produce tea. It is of the ge ...
''. After plain water, tea is the most widely consumed drink in the world. There are many different types of tea; some have a cooling, slightly bitter, and
astringent An astringent (sometimes called adstringent) is a chemical that shrinks or constricts body tissues. The word derives from the Latin ''adstringere'', which means "to bind fast". Calamine lotion, witch hazel, and yerba mansa, a Californian pla ...
flavour, while others have vastly different profiles that include sweet, nutty, floral, or grassy
notes Note, notes, or NOTE may refer to: Music and entertainment * Musical note, a pitched sound (or a symbol for a sound) in music * ''Notes'' (album), a 1987 album by Paul Bley and Paul Motian * ''Notes'', a common (yet unofficial) shortened versio ...
. Tea has a stimulating effect in humans primarily due to its
caffeine Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is mainly used recreationally as a cognitive enhancer, increasing alertness and attentional performance. Caffeine acts by blocking binding of adenosine to ...
content. An early credible record of tea drinking dates to the third century AD, in a medical text written by Chinese physician
Hua Tuo Hua Tuo ( 140–208), courtesy name Yuanhua, was a Chinese physician who lived during the late Eastern Han dynasty. The historical texts ''Records of the Three Kingdoms'' and ''Book of the Later Han'' record Hua Tuo as the first person in China ...
. It was popularised as a recreational drink during the Chinese
Tang dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an imperial dynasty of China that ruled from 618 to 907 AD, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdom ...
, and tea drinking subsequently spread to other East Asian countries. Portuguese priests and merchants introduced it to Europe during the 16th century. During the 17th century, drinking tea became fashionable among the
English English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national ide ...
, who started to plant tea on a large scale in
British India The provinces of India, earlier presidencies of British India and still earlier, presidency towns, were the administrative divisions of British governance on the Indian subcontinent. Collectively, they have been called British India. In one ...
. The term ''
herbal tea Herbal teas, also known as herbal infusions and less commonly called tisanes (UK and US , US also ), are beverages made from the infusion or decoction of herbs, spices, or other plant material in hot water. Oftentimes herb tea, or the plain term ...
'' refers to drinks not made from ''Camellia sinensis''. They are the infusions of fruit, leaves, or other plant parts, such as steeps of
rosehip The rose hip or rosehip, also called rose haw and rose hep, is the accessory fruit of the various species of rose plant. It is typically red to orange, but ranges from dark purple to black in some species. Rose hips begin to form after pollinat ...
,
chamomile Chamomile (American English) or camomile (British English; see spelling differences) ( or ) is the common name for several plants of the family Asteraceae. Two of the species, ''Matricaria recutita'' and ''Anthemis nobilis'', are commonly us ...
, or
rooibos Rooibos ( ; , meaning "red bush"), or ''Aspalathus linearis'', is a broom-like member of the plant family Fabaceae that grows in South Africa's fynbos biome. The leaves are used to make a herbal tea that is called rooibos (especially in S ...
. These may be called ''tisanes'' or ''herbal infusions'' to prevent confusion with tea made from the tea plant.


Etymology

The
etymology Etymology ()The New Oxford Dictionary of English (1998) – p. 633 "Etymology /ˌɛtɪˈmɒlədʒi/ the study of the class in words and the way their meanings have changed throughout time". is the study of the history of the Phonological chan ...
of the various words for ''tea'' reflects the history of transmission of tea drinking culture and trade from China to countries around the world. Nearly all of the words for tea worldwide fall into three broad groups: ''te'', ''cha'' and ''chai'', present in English as ''tea'', ''cha'' or ''char'', and ''chai''. The earliest of the three to enter English is ''cha'', which came in the 1590s via the Portuguese, who traded in
Macao Macau or Macao (; ; ; ), officially the Macao Special Administrative Region of the People's Republic of China (MSAR), is a city and special administrative region of China in the western Pearl River Delta by the South China Sea. With a po ...
and picked up the
Cantonese Cantonese ( zh, t=廣東話, s=广东话, first=t, cy=Gwóngdūng wá) is a language within the Chinese (Sinitic) branch of the Sino-Tibetan languages originating from the city of Guangzhou (historically known as Canton) and its surrounding ar ...
pronunciation of the word. The more common ''tea'' form arrived in the 17th century via the Dutch, who acquired it either indirectly from the Malay ''teh'', or directly from the ''tê'' pronunciation in Min Chinese. The third form ''chai'' (meaning "spiced tea") originated from a northern Chinese pronunciation of ''cha'', which travelled overland to Central Asia and
Persia Iran, officially the Islamic Republic of Iran, and also called Persia, is a country located in Western Asia. It is bordered by Iraq and Turkey to the west, by Azerbaijan and Armenia to the northwest, by the Caspian Sea and Turkmeni ...
where it picked up a Persian ending ''yi''.


Origin and history


Botanical origin

Tea plants are native to East Asia and probably originated in the borderlands of southwestern China and northern Myanmar. Chinese (small-leaf) type tea (''C. sinensis'' var. ''sinensis'') may have originated in southern China possibly with hybridization of unknown wild tea relatives. However, since there are no known wild populations of this tea, its origin is speculative. Given their genetic differences forming distinct clades, Chinese Assam-type tea (''C. sinensis'' var. ''assamica'') may have two different parentages – one being found in southern
Yunnan Yunnan , () is a landlocked province in the southwest of the People's Republic of China. The province spans approximately and has a population of 48.3 million (as of 2018). The capital of the province is Kunming. The province borders the C ...
( Xishuangbanna,
Pu'er City Pu'er is a prefecture-level city in southern Yunnan Province, China. The urban administrative center of Pu'er is Simao District, which is also the former name of the prefecture-level city itself. A major downturn in the price of tea in 2007 caus ...
) and the other in western Yunnan (
Lincang Lincang () is a prefecture-level city located in the southwest of Yunnan province, People's Republic of China. History Lincang was previously called Baihuai during the Shang dynasty. On December 26, 2003, the state council approved the cancell ...
, Baoshan). Many types of Southern Yunnan Assam tea have been hybridized with the closely related species ''
Camellia taliensis ''Camellia taliensis'' (also known as Yunnan large leaf varietal tea, wild tea, Dali tea, Yunnan broad tea, and others; 大理茶) is a species of evergreen shrub or small tree whose leaves and leaf buds are used to produce tea. It is of the ge ...
''. Unlike Southern Yunnan Assam tea, Western Yunnan Assam tea shares many genetic similarities with Indian Assam-type tea (also ''C. sinensis'' var. ''assamica''). Thus, Western Yunnan Assam tea and Indian Assam tea both may have originated from the same parent plant in the area where southwestern China, Indo-Burma, and Tibet meet. However, as the Indian Assam tea shares no haplotypes with Western Yunnan Assam tea, Indian Assam tea is likely to have originated from an independent domestication. Some Indian Assam tea appears to have hybridized with the species '' Camellia pubicosta''. Assuming a generation of 12 years, Chinese small-leaf tea is estimated to have diverged from Assam tea around 22,000 years ago, while Chinese Assam tea and Indian Assam tea diverged 2,800 years ago. The divergence of Chinese small-leaf tea and Assam tea would correspond to the last
glacial maximum An ice age is a long period of reduction in the temperature of Earth's surface and atmosphere, resulting in the presence or expansion of continental and polar ice sheets and alpine glaciers. Earth's climate alternates between ice ages and gree ...
.


Early tea drinking

People in ancient East Asia ate tea for centuries, perhaps even
millennia A millennium (plural millennia or millenniums) is a period of one thousand years, sometimes called a kiloannum (ka), or kiloyear (ky). Normally, the word is used specifically for periods of a thousand years that begin at the starting point (ini ...
, before ever consuming it as a beverage. They would nibble on the leaves raw, add them to
soups Soup is a primarily liquid food, generally served warm or hot (but may be cool or cold), that is made by combining ingredients of meat or vegetables with stock, milk, or water. Hot soups are additionally characterized by boiling solid ingr ...
or greens, or
ferment Fermentation is a metabolic process that produces chemical changes in organic substrates through the action of enzymes. In biochemistry, it is narrowly defined as the extraction of energy from carbohydrates in the absence of oxygen. In food ...
them and chew it like how betel is chewed. Tea drinking may have begun in the region of
Yunnan Yunnan , () is a landlocked province in the southwest of the People's Republic of China. The province spans approximately and has a population of 48.3 million (as of 2018). The capital of the province is Kunming. The province borders the C ...
, where it was used for medicinal purposes. It is also believed that in
Sichuan Sichuan (; zh, c=, labels=no, ; zh, p=Sìchuān; alternatively romanized as Szechuan or Szechwan; formerly also referred to as "West China" or "Western China" by Protestant missions) is a province in Southwest China occupying most of the ...
, "people began to boil tea leaves for consumption into a concentrated liquid without the addition of other leaves or herbs, thereby using tea as a bitter yet stimulating drink, rather than as a medicinal concoction." Chinese legends attribute the invention of tea to the mythical
Shennong Shennong (), variously translated as "Divine Farmer" or "Divine Husbandman", born Jiang Shinian (), was a mythological Chinese ruler known as the first Yan Emperor who has become a deity in Chinese and Vietnamese folk religion. He is vene ...
(in central and northern China) in 2737 BC, although evidence suggests that tea drinking may have been introduced from the southwest of China (Sichuan/Yunnan area). The earliest written records of tea come from China. The word ''tú'' appears in the ''
Shijing The ''Classic of Poetry'', also ''Shijing'' or ''Shih-ching'', translated variously as the ''Book of Songs'', ''Book of Odes'', or simply known as the ''Odes'' or ''Poetry'' (; ''Shī''), is the oldest existing collection of Chinese poetry, co ...
'' and other ancient texts to signify a kind of "bitter vegetable" (), and it is possible that it referred to many different plants such as sow thistle,
chicory Common chicory (''Cichorium intybus'') is a somewhat woody, perennial herbaceous plant of the family Asteraceae, usually with bright blue flowers, rarely white or pink. Native to the Old World, it has been introduced to North America and Austra ...
, or smartweed, as well as tea. In the ''
Chronicles of Huayang The ''Chronicles of Huayang'' or ''Huayang Guo Zhi'' () is the oldest extant gazetteer of a region of China. It was compiled by Chang Qu during the Jin Dynasty. It contains roughly 110,000 characters. Its contents comprise history, geography an ...
'', it was recorded that the Ba people in Sichuan presented ''tu'' to the Zhou king. The Qin later conquered the state of Ba and its neighbour Shu, and according to the 17th century scholar Gu Yanwu who wrote in ''Ri Zhi Lu'' (): "It was after the Qin had taken Shu that they learned how to drink tea." Another possible early reference to tea is found in a letter written by the
Qin dynasty The Qin dynasty ( ; zh, c=秦朝, p=Qín cháo, w=), or Ch'in dynasty in Wade–Giles romanization ( zh, c=, p=, w=Ch'in ch'ao), was the first dynasty of Imperial China. Named for its heartland in Qin state (modern Gansu and Shaanxi), ...
general Liu Kun who requested that some "real tea" to be sent to him. The earliest known physical evidence of tea was discovered in 2016 in the mausoleum of Emperor Jing of Han in
Xi'an Xi'an ( , ; ; Chinese: ), frequently spelled as Xian and also known by other names, is the capital of Shaanxi Province. A sub-provincial city on the Guanzhong Plain, the city is the third most populous city in Western China, after Chongqi ...
, indicating that tea from the genus ''Camellia'' was drunk by
Han dynasty The Han dynasty (, ; ) was an imperial dynasty of China (202 BC – 9 AD, 25–220 AD), established by Liu Bang (Emperor Gao) and ruled by the House of Liu. The dynasty was preceded by the short-lived Qin dynasty (221–207 BC) and a warr ...
emperors as early as the second century BC. The Han dynasty work, "The Contract for a Youth", written by Wang Bao in 59 BC, contains the first known reference to boiling tea. Among the tasks listed to be undertaken by the youth, the contract states that "he shall boil tea and fill the utensils" and "he shall buy tea at Wuyang". The first record of tea cultivation is also dated to this period, during which tea was cultivated on Meng Mountain () near
Chengdu Chengdu (, ; simplified Chinese: 成都; pinyin: ''Chéngdū''; Sichuanese pronunciation: , Standard Chinese pronunciation: ), alternatively romanized as Chengtu, is a sub-provincial city which serves as the capital of the Chinese pro ...
. Another early credible record of tea drinking dates to the 3rd century AD, in a medical text by Hua Tuo, who stated, "to drink bitter t'u constantly makes one think better." However, before the mid-8th century
Tang dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an imperial dynasty of China that ruled from 618 to 907 AD, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdom ...
, tea-drinking was primarily a southern Chinese practice. Tea was disdained by the
Northern dynasties The Northern and Southern dynasties () was a period of political division in the history of China that lasted from 420 to 589, following the tumultuous era of the Sixteen Kingdoms and the Eastern Jin dynasty. It is sometimes considered as ...
aristocrats, who describe it as a "slaves' drink", inferior to yogurt. It became widely popular during the
Tang dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an imperial dynasty of China that ruled from 618 to 907 AD, with an interregnum between 690 and 705. It was preceded by the Sui dynasty and followed by the Five Dynasties and Ten Kingdom ...
, when it was spread to Korea, Japan, and Vietnam. ''
The Classic of Tea ''The Classic of Tea'' or ''Tea Classic'' () is the first known monograph on tea in the world, by Chinese writer Lu Yu between 760 CE and 762 CE, during the Tang dynasty. Lu Yu's original manuscript is lost; the earliest editions available da ...
'', a treatise on tea and its preparations, was written by the 8th century Chinese writer,
Lu Yu Lu Yu (; 733–804) or Lu Ji (陆疾), courtesy name Jici (季疵) was a Chinese tea master and writer. He is respected as the Sage of Tea for his contribution to Chinese tea culture. He is best known for his monumental book ''The Classic of ...
. He was known to have influenced tea drinking on a large part in China.


Developments

Through the centuries, a variety of techniques for processing tea, and a number of different forms of tea, were developed. During the Tang dynasty, tea was steamed, then pounded and shaped into cake form, while in the
Song dynasty The Song dynasty (; ; 960–1279) was an imperial dynasty of China that began in 960 and lasted until 1279. The dynasty was founded by Emperor Taizu of Song following his usurpation of the throne of the Later Zhou. The Song conquered the rest ...
, loose-leaf tea was developed and became popular. During the Yuan and
Ming The Ming dynasty (), officially the Great Ming, was an imperial dynasty of China, ruling from 1368 to 1644 following the collapse of the Mongol-led Yuan dynasty. The Ming dynasty was the last orthodox dynasty of China ruled by the Han peop ...
dynasties, unoxidized tea leaves were first stirred in a hot dry pan, then rolled and air-dried, a process that stops the
oxidation Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a ...
process that would have turned the leaves dark, thereby allowing tea to remain green. In the 15th century, oolong tea, in which the leaves are allowed to partially oxidize before being heated in the pan, was developed. Western tastes, however, favoured the fully oxidized
black tea Black tea, also translated to red tea in various East Asian languages, is a type of tea that is more oxidized than oolong, yellow, white and green teas. Black tea is generally stronger in flavour than other teas. All five types are made from ...
, and the leaves were allowed to oxidize further. Yellow tea was an accidental discovery in the production of green tea during the Ming dynasty, when apparently careless practices allowed the leaves to turn yellow, which yielded a different flavour.


Worldwide spread

Tea was first introduced to Western priests and merchants in China during the 16th century, at which time it was termed ''chá''. The earliest European reference to tea, written as ''chiai'', came from ''Delle navigationi e viaggi'' written by Venetian
Giambattista Ramusio Giovanni Battista Ramusio (; July 20, 1485 – July 10, 1557) was an Italian geographer and travel writer. Born in Treviso, Italy, at that time in the Republic of Venice, Ramusio was the son of Paolo Ramusio, a magistrate of the Venetian c ...
in 1545. The first recorded shipment of tea by a European nation was in 1607 when the Dutch East India Company moved a cargo of tea from
Macao Macau or Macao (; ; ; ), officially the Macao Special Administrative Region of the People's Republic of China (MSAR), is a city and special administrative region of China in the western Pearl River Delta by the South China Sea. With a po ...
to Java, then two years later, the Dutch bought the first assignment of tea which was from
Hirado is a city located in Nagasaki Prefecture, Japan. The part historically named Hirado is located on Hirado Island. With recent mergers, the city's boundaries have expanded, and Hirado now occupies parts of the main island of Kyushu. The component ...
in Japan to be shipped to Europe. Tea became a fashionable drink in
The Hague The Hague ( ; nl, Den Haag or ) is a city and municipality of the Netherlands, situated on the west coast facing the North Sea. The Hague is the country's administrative centre and its seat of government, and while the official capital o ...
in the Netherlands, and the Dutch introduced the drink to Germany, France, and across the Atlantic to New Amsterdam (New York). In 1567, Russian people came in contact with tea when the Cossack Atamans Petrov and Yalyshev visited China. The Mongolian Khan donated to
Tsar Tsar ( or ), also spelled ''czar'', ''tzar'', or ''csar'', is a title used by East and South Slavic monarchs. The term is derived from the Latin word ''caesar'', which was intended to mean "emperor" in the European medieval sense of the ter ...
Michael I Michael I may refer to: * Pope Michael I of Alexandria, Coptic Pope of Alexandria and Patriarch of the See of St. Mark in 743–767 * Michael I Rhangabes, Byzantine Emperor (died in 844) * Michael I Cerularius, Patriarch Michael I of Constantin ...
four
pood ''Pood'' ( rus, пуд, r=pud, p=put, plural: or ) is a unit of mass equal to 40 ''funt'' (, Russian pound). Since 1899 it is set to approximately 16.38 kilograms (36.11 pounds). It was used in Russia, Belarus, and Ukraine. ''Pood'' was first m ...
s (65–70 kg) of tea in 1638. According to Jeremiah Curtin, it was possibly in 1636 that Vassili Starkov was sent as envoy to the Altyn Khan. He was given 250 pounds of tea as a gift to the tsar. Starkov at first refused, seeing no use for a load of dead leaves, but the Khan insisted. Thus was tea introduced to Russia. In 1679, Russia concluded a treaty on regular tea supplies from China via
camel caravan A camel train or caravan is a series of camels carrying passengers and goods on a regular or semi-regular service between points. Despite rarely travelling faster than human walking speed, for centuries camels' ability to withstand harsh condi ...
in exchange for furs. It is today considered the ''de facto'' national beverage. The first record of tea in English came from a letter written by Richard Wickham, who ran an
East India Company The East India Company (EIC) was an English, and later British, joint-stock company founded in 1600 and dissolved in 1874. It was formed to trade in the Indian Ocean region, initially with the East Indies (the Indian subcontinent and South ...
office in Japan, writing to a merchant in Macao requesting "the best sort of chaw" in 1615. Peter Mundy, a traveller and merchant who came across tea in
Fujian Fujian (; alternately romanized as Fukien or Hokkien) is a province on the southeastern coast of China. Fujian is bordered by Zhejiang to the north, Jiangxi to the west, Guangdong to the south, and the Taiwan Strait to the east. Its cap ...
in 1637, wrote, "''chaa'' – only water with a kind of herb boyled in it". Tea was sold in a coffee house in London in 1657, Samuel Pepys tasted tea in 1660, and
Catherine of Braganza Catherine of Braganza ( pt, Catarina de Bragança; 25 November 1638 – 31 December 1705) was Queen of England, Scotland and Ireland during her marriage to King Charles II, which lasted from 21 May 1662 until his death on 6 February 1685. She ...
took the tea-drinking habit to the English court when she married Charles II in 1662. Tea, however, was not widely consumed in the British Isles until the 18th century and remained expensive until the latter part of that period. English drinkers preferred to add sugar and milk to black tea, and black tea overtook green tea in popularity in the 1720s. Tea smuggling during the 18th century led to the general public being able to afford and consume tea. The British government removed the tax on tea, thereby eliminating the smuggling trade, by 1785. In Britain and Ireland, tea was initially consumed as a luxury item on special occasions, such as religious festivals, wakes, and domestic work gatherings. The price of tea in Europe fell steadily during the 19th century, especially after Indian tea began to arrive in large quantities; by the late 19th century tea had become an everyday beverage for all levels of society. The popularity of tea played a role in historical events – the
Tea Act The Tea Act 1773 (13 Geo 3 c 44) was an Act of the Parliament of Great Britain. The principal objective was to reduce the massive amount of tea held by the financially troubled British East India Company in its London warehouses and to help th ...
of 1773 provoked the
Boston Tea Party The Boston Tea Party was an American political and mercantile protest by the Sons of Liberty in Boston, Massachusetts, on December 16, 1773. The target was the Tea Act of May 10, 1773, which allowed the British East India Company to sell t ...
that escalated into the
American Revolution The American Revolution was an ideological and political revolution that occurred in British America between 1765 and 1791. The Americans in the Thirteen Colonies formed independent states that defeated the British in the American Revoluti ...
. The need to address the issue of British trade deficit because of the trade in tea resulted in the
Opium Wars The Opium Wars () were two conflicts waged between China and Western powers during the mid-19th century. The First Opium War was fought from 1839 to 1842 between China and the United Kingdom, and was triggered by the Chinese government's c ...
. The Qing
Kangxi Emperor The Kangxi Emperor (4 May 1654– 20 December 1722), also known by his temple name Emperor Shengzu of Qing, born Xuanye, was the third emperor of the Qing dynasty, and the second Qing emperor to rule over China proper, reigning from 1661 to ...
had banned foreign products from being sold in China, decreeing in 1685 that all goods bought from China must be paid for in silver coin or bullion. Traders from other nations then sought to find another product, in this case opium, to sell to China to earn back the silver they were required to pay for tea and other commodities. The subsequent attempts by the Chinese Government to curtail the trade in opium led to war. Chinese small-leaf-type tea was introduced into India in 1836 by the British in an attempt to break the Chinese monopoly on tea. In 1841,
Archibald Campbell Archibald Campbell may refer to: Peerage * Archibald Campbell of Lochawe (died before 1394), Scottish peer * Archibald Campbell, 2nd Earl of Argyll (died 1513), Lord Chancellor of Scotland * Archibald Campbell, 4th Earl of Argyll (c. 1507–1558) ...
brought seeds of Chinese tea from the Kumaun region and experimented with planting tea in
Darjeeling Darjeeling (, , ) is a town and municipality in the northernmost region of the Indian state of West Bengal. Located in the Eastern Himalayas, it has an average elevation of . To the west of Darjeeling lies the easternmost province of Nepal ...
. The Alubari tea garden was opened in 1856, and
Darjeeling tea Darjeeling tea is a tea made from ''Camellia sinensis var. sinensis'' that is grown and processed in Darjeeling or Kalimpong Districts in West Bengal, India. Since 2004, the term ''Darjeeling tea'' has been a registered geographical indication ...
began to be produced. In 1848,
Robert Fortune Robert Fortune (16 September 1812 – 13 April 1880) was a Scottish botanist, plant hunter and traveller, best known for introducing around 250 new ornamental plants, mainly from China, but also Japan, into the gardens of Britain, Australia, an ...
was sent by the
Honourable East India Company The East India Company (EIC) was an English, and later British, joint-stock company founded in 1600 and dissolved in 1874. It was formed to trade in the Indian Ocean region, initially with the East Indies (the Indian subcontinent and Southea ...
on a mission to China to bring the tea plant back to Great Britain. He began his journey in high secrecy as his mission occurred in the lull between the First Opium War and the Second Opium War. The Chinese tea plants he brought back were introduced to the
Himalayas The Himalayas, or Himalaya (; ; ), is a mountain range in Asia, separating the plains of the Indian subcontinent from the Tibetan Plateau. The range has some of the planet's highest peaks, including the very highest, Mount Everest. Over 10 ...
, though most did not survive. The British had discovered that a different variety of tea was endemic to
Assam Assam (; ) is a state in northeastern India, south of the eastern Himalayas along the Brahmaputra and Barak River valleys. Assam covers an area of . The state is bordered by Bhutan and Arunachal Pradesh to the north; Nagaland and Manipur ...
and the northeast region of India, which was then hybridized with Chinese small-leaf-type tea. Using Chinese planting and cultivation techniques, the British colonial government established a tea industry by offering land in Assam to any European who agreed to cultivate it for export. Tea was originally consumed only by Anglo-Indians; however, it became widely popular in India in the 1950s because of a successful advertising campaign by the India Tea Board. The British introduced tea industry to Sri Lanka (then Ceylon) in 1867.


Chemical composition

Physically speaking, tea has properties of both a solution and a
suspension Suspension or suspended may refer to: Science and engineering * Suspension (topology), in mathematics * Suspension (dynamical systems), in mathematics * Suspension of a ring, in mathematics * Suspension (chemistry), small solid particles suspende ...
. It is a solution of all the water-soluble compounds that have been extracted from the tea leaves, such as the polyphenols and amino acids, but is a suspension when all of the insoluble components are considered, such as the cellulose in the tea leaves. Tea infusions are among most consumed beverages globally.
Caffeine Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is mainly used recreationally as a cognitive enhancer, increasing alertness and attentional performance. Caffeine acts by blocking binding of adenosine to ...
constitutes about 3% of tea's dry weight, translating to between 30 and 90 milligrams per cup depending on the type, brand, and brewing method. A study found that the caffeine content of one gram of black tea ranged from 22 to 28 mg, while the caffeine content of one gram of green tea ranged from 11 to 20 mg, reflecting a significant difference. Tea also contains small amounts of
theobromine Theobromine, also known as xantheose, is the principal alkaloid of '' Theobroma cacao'' (cacao plant). Theobromine is slightly water-soluble (330 mg/L) with a bitter taste. In industry, theobromine is used as an additive and precursor to ...
and
theophylline Theophylline, also known as 1,3-dimethylxanthine, is a phosphodiesterase inhibiting drug used in therapy for respiratory diseases such as chronic obstructive pulmonary disease (COPD) and asthma under a variety of brand names. As a member of the ...
, which are stimulants, and
xanthine Xanthine ( or ; archaically xanthic acid; systematic name 3,7-dihydropurine-2,6-dione) is a purine base found in most human body tissues and fluids, as well as in other organisms. Several stimulants are derived from xanthine, including caffeine ...
s similar to caffeine. The astringency in tea can be attributed to the presence of
polyphenol Polyphenols () are a large family of naturally occurring organic compounds characterized by multiples of phenol units. They are abundant in plants and structurally diverse. Polyphenols include flavonoids, tannic acid, and ellagitannin, some o ...
s. These are the most abundant compounds in tea leaves, making up 30–40% of their composition. Polyphenols include flavonoids, epigallocatechin gallate (EGCG), and other
catechins Flavan-3-ols (sometimes referred to as flavanols) are a subgroup of flavonoids. They are derivatives of flavans that possess a 2-phenyl-3,4-dihydro-2''H''-chromen-3-ol skeleton. Flavan-3-ols are structurally diverse and include a range of comp ...
. Although there has been preliminary
clinical research Clinical research is a branch of healthcare science that determines the safety and effectiveness ( efficacy) of medications, devices, diagnostic products and treatment regimens intended for human use. These may be used for prevention, treatm ...
on whether green or black teas may protect against various human diseases, there is no evidence that tea polyphenols have any effect on health or lowering disease risk.


Health effects

Although health benefits have been assumed throughout the history of '' Camellia sinensis'' 's consumption, there is no high-quality evidence showing that tea consumption gives significant benefits other than possibly increasing alertness, an effect caused by
caffeine Caffeine is a central nervous system (CNS) stimulant of the methylxanthine class. It is mainly used recreationally as a cognitive enhancer, increasing alertness and attentional performance. Caffeine acts by blocking binding of adenosine to ...
in the tea leaves. In
clinical research Clinical research is a branch of healthcare science that determines the safety and effectiveness ( efficacy) of medications, devices, diagnostic products and treatment regimens intended for human use. These may be used for prevention, treatm ...
conducted in the early 21st century, it was found there is no scientific evidence to indicate that consuming tea affects any disease or improves health. Black and green teas contain no
essential nutrients A nutrient is a substance used by an organism to survive, grow, and reproduce. The requirement for dietary nutrient intake applies to animals, plants, fungi, and protists. Nutrients can be incorporated into cells for metabolic purposes or excre ...
in significant amounts, with the exception of the dietary mineral
manganese Manganese is a chemical element with the symbol Mn and atomic number 25. It is a hard, brittle, silvery metal, often found in minerals in combination with iron. Manganese is a transition metal with a multifaceted array of industrial alloy use ...
, at 0.5 mg per cup or 26% of the
Reference Daily Intake The Reference Daily Intake (RDI) used in nutrition labeling on food and dietary supplement products in the U.S. and Canada is the daily intake level of a nutrient that is considered to be sufficient to meet the requirements of 97–98% of healt ...
(RDI). Fluoride is sometimes present in tea; certain types of "brick tea", made from old leaves and stems, have the highest levels, enough to pose a health risk if much tea is drunk, which has been attributed to high levels of fluoride in soils, acidic soils, and long brewing.


Cultivation and harvesting

''Camellia sinensis'' is an evergreen plant that grows mainly in
tropical The tropics are the regions of Earth surrounding the Equator. They are defined in latitude by the Tropic of Cancer in the Northern Hemisphere at N and the Tropic of Capricorn in the Southern Hemisphere at S. The tropics are also referred to ...
and subtropical climates. Some varieties can also tolerate marine climates and are cultivated as far north as
Cornwall Cornwall (; kw, Kernow ) is a historic county and ceremonial county in South West England. It is recognised as one of the Celtic nations, and is the homeland of the Cornish people. Cornwall is bordered to the north and west by the Atlantic ...
in England, Perthshire in Scotland,
Washington Washington commonly refers to: * Washington (state), United States * Washington, D.C., the capital of the United States ** A metonym for the federal government of the United States ** Washington metropolitan area, the metropolitan area centered o ...
in the United States, and
Vancouver Island Vancouver Island is an island in the northeastern Pacific Ocean and part of the Canadian province of British Columbia. The island is in length, in width at its widest point, and in total area, while are of land. The island is the largest by ...
in Canada. In the Southern Hemisphere, tea is grown as far south as Hobart in Tasmania and
Waikato Waikato () is a local government region of the upper North Island of New Zealand. It covers the Waikato District, Waipa District, Matamata-Piako District, South Waikato District and Hamilton City, as well as Hauraki, Coromandel Peninsul ...
in New Zealand. Tea plants are propagated from seed and cuttings; about 4 to 12 years are needed for a plant to bear seed and about three years before a new plant is ready for harvesting. In addition to a zone 8 climate or warmer, tea plants require at least 127 cm (50 in) of rainfall per year and prefer acidic soils. Many high-quality tea plants are cultivated at elevations of up to above sea level. Though at these heights the plants grow more slowly, they acquire a better flavour. Two principal varieties are used: ''Camellia sinensis'' var. ''sinensis,'' which is used for most Chinese, Formosan and Japanese teas, and ''C. sinensis'' var. ''assamica,'' used in
Pu-erh ''Pu'er'' or ''pu-erh'' is a variety of fermented tea traditionally produced in Yunnan Province, China. In the context of traditional Chinese tea production terminology, fermentation refers to microbial fermentation (called 'wet piling'), and ...
and most Indian teas (but not Darjeeling). Within these botanical varieties, many strains and modern clonal varieties are known. Leaf size is the chief criterion for the classification of tea plants, with three primary classifications being:
Assam Assam (; ) is a state in northeastern India, south of the eastern Himalayas along the Brahmaputra and Barak River valleys. Assam covers an area of . The state is bordered by Bhutan and Arunachal Pradesh to the north; Nagaland and Manipur ...
type, characterised by the largest leaves; China type, characterised by the smallest leaves; and Cambodian type, characterised by leaves of intermediate size. The Cambodian-type tea (''C. assamica'' subsp. ''lasiocaly'') was originally considered a type of Assam tea. However, later genetic work showed that it is a hybrid between Chinese small-leaf tea and Assam-type tea. Darjeeling tea also appears to be a hybrid between Chinese small-leaf tea and Assam-type large-leaf tea. A tea plant will grow into a tree of up to if left undisturbed, but cultivated plants are generally pruned to waist height for ease of plucking. Also, the short plants bear more new shoots which provide new and tender leaves and increase the quality of the tea. Only the top of the mature plant are picked. These buds and leaves are called 'flushes'. A plant will grow a new flush every 7 to 15 days during the growing season. Leaves that are slow in development tend to produce better-flavoured teas. Several teas are available from specified flushes; for example, Darjeeling tea is available as first flush (at a premium price), second flush, monsoon and autumn. Assam second flush or "tippy" tea is considered superior to first flush, because of the gold tips that appear on the leaves. Pests that can afflict tea plants include mosquito bugs, genus '' Helopeltis'', which are
true bugs Hemiptera (; ) is an order (biology), order of insects, commonly called true bugs, comprising over 80,000 species within groups such as the cicadas, aphids, planthoppers, leafhoppers, Reduviidae, assassin bugs, Cimex, bed bugs, and shield bugs. ...
and not to be confused with dipterous insects of family ''Culicidae'' ('mosquitos'). Mosquito bugs can damage leaves both by sucking plant materials, and by the laying of eggs (oviposition) within the plant. Spraying with synthetic insecticides may be deemed appropriate. Other pests are
Lepidopteran Lepidoptera ( ) is an order of insects that includes butterflies and moths (both are called lepidopterans). About 180,000 species of the Lepidoptera are described, in 126 families and 46 superfamilies, 10 percent of the total described specie ...
leaf feeders and various tea diseases.


Production

Tea is mainly grown in Asia and Africa, though it is also grown in South America and around the Black and Caspian Seas. The four biggest tea-producing countries are China, India, Kenya and Sri Lanka, together representing 75% of world tea production. Smaller hubs of production include such places as São Miguel Island, Azores, in Portugal, and
Guria Guria ( ka, გურია) is a region (''mkhare'') in Georgia, in the western part of the country, bordered by the eastern end of the Black Sea. The region has a population of 113,000 (2016), with Ozurgeti as the regional capital. Geography ...
, in Georgia. In 2020, global production of tea was 7.0 million
tonne The tonne ( or ; symbol: t) is a unit of mass equal to 1000  kilograms. It is a non-SI unit accepted for use with SI. It is also referred to as a metric ton to distinguish it from the non-metric units of the short ton ( United State ...
s, led by China with 42% and India with 20% of the world total.
Kenya ) , national_anthem = " Ee Mungu Nguvu Yetu"() , image_map = , map_caption = , image_map2 = , capital = Nairobi , coordinates = , largest_city = Nairobi ...
,
Argentina Argentina (), officially the Argentine Republic ( es, link=no, República Argentina), is a country in the southern half of South America. Argentina covers an area of , making it the second-largest country in South America after Brazil, th ...
, and Sri Lanka were secondary producers.


Storage

Storage conditions and type determine the
shelf life Shelf life is the length of time that a commodity may be stored without becoming unfit for use, consumption, or sale. In other words, it might refer to whether a commodity should no longer be on a pantry shelf (unfit for use), or no longer on a ...
of tea; that of black teas is greater than that of green teas. Some, such as flower teas, may last only a month or so. Others, such as pu-erh, improve with age. To remain fresh and prevent mold, tea needs to be stored away from heat, light, air, and moisture. Tea must be kept at room temperature in an air-tight container. Black tea in a bag within a sealed opaque canister may keep for two years. Green tea deteriorates more rapidly, usually in less than a year. Tightly rolled gunpowder tea leaves keep longer than the more open-leafed Chun Mee tea. Storage life for all teas can be extended by using desiccant or oxygen-absorbing packets, vacuum sealing, or refrigeration in air-tight containers (except green tea, where discrete use of refrigeration or freezing is recommended and temperature variation kept to a minimum).


Processing and classification

Tea is generally divided into categories based on how it is processed. At least six different types are produced: *
White White is the lightest color and is achromatic (having no hue). It is the color of objects such as snow, chalk, and milk, and is the opposite of black. White objects fully reflect and scatter all the visible wavelengths of light. White o ...
: wilted and unoxidized; *
Yellow Yellow is the color between green and orange on the spectrum of light. It is evoked by light with a dominant wavelength of roughly 575585 nm. It is a primary color in subtractive color systems, used in painting or color printing. In the ...
: unwilted and unoxidized but allowed to yellow; *
Green Green is the color between cyan and yellow on the visible spectrum. It is evoked by light which has a dominant wavelength of roughly 495570 nm. In subtractive color systems, used in painting and color printing, it is created by a combi ...
: unwilted and unoxidized; * Oolong: wilted, bruised, and partially oxidized; *
Black Black is a color which results from the absence or complete absorption of visible light. It is an achromatic color, without hue, like white and grey. It is often used symbolically or figuratively to represent darkness. Black and white ...
: wilted, sometimes crushed, and fully oxidized (called 'hóngchá'' "red tea" in Chinese and other East Asian tea culture); * Post-fermented (Dark): green tea that has been allowed to ferment/compost (called ''Pu'er'' if from the Yunnan district of South-Western China or 'hēichá''"black tea" in Chinese tea culture). After picking, the leaves of ''C. sinensis'' soon begin to wilt and
oxidize Redox (reduction–oxidation, , ) is a type of chemical reaction in which the oxidation states of substrate change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is the gain of electrons or a d ...
unless immediately dried. An
enzymatic oxidation Browning is the process of food turning brown due to the chemical reactions that take place within. The process of browning is one of the chemical reactions that take place in food chemistry and represents an interesting research topic regardin ...
process triggered by the plant's intracellular
enzyme Enzymes () are proteins that act as biological catalysts by accelerating chemical reactions. The molecules upon which enzymes may act are called substrates, and the enzyme converts the substrates into different molecules known as products ...
s causes the leaves to turn progressively darker as their chlorophyll breaks down and tannins are released. This darkening is stopped at a predetermined stage by heating, which deactivates the enzymes responsible. In the production of black teas, halting by heating is carried out simultaneously with drying. Without careful moisture and temperature control during manufacture and packaging, growth of undesired molds and bacteria may make tea unfit for consumption.


Additional processing and additives

After basic processing, teas may be altered through additional processing steps before being sold and is often consumed with additions to the basic tea leaf and water added during preparation or drinking. Examples of additional processing steps that occur before tea is sold are blending, flavouring, scenting, and decaffeination of teas. Examples of additions added at the point of consumption include milk, sugar and lemon. Tea blending is the combination of different teas together to achieve the final product. Such teas may combine others from the same cultivation area or several different ones. The aim is to obtain consistency, better taste, higher price, or some combination of the three. Flavoured and scented teas add aromas and flavours to the base tea. This can be accomplished through directly adding flavouring agents, such as ginger, cloves, mint leaves,
cardamom Cardamom (), sometimes cardamon or cardamum, is a spice made from the seeds of several plants in the genera ''Elettaria'' and ''Amomum'' in the family Zingiberaceae. Both genera are native to the Indian subcontinent and Indonesia. They are r ...
, bergamot (found in
Earl Grey Earl Grey is a title in the peerage of the United Kingdom. It was created in 1806 for General Charles Grey, 1st Baron Grey. In 1801, he was given the title Baron Grey of Howick in the County of Northumberland, and in 1806 he was created Viscou ...
),
vanilla Vanilla is a spice derived from orchids of the genus ''Vanilla (genus), Vanilla'', primarily obtained from pods of the Mexican species, flat-leaved vanilla (''Vanilla planifolia, V. planifolia''). Pollination is required to make the p ...
, and
spearmint Spearmint, also known as garden mint, common mint, lamb mint and mackerel mint, is a species of mint, ''Mentha spicata'' (, native to Europe and southern temperate Asia, extending from Ireland in the west to southern China in the east. It is nat ...
. Alternatively, because tea easily retains odours, it can be placed in proximity to an aromatic ingredient to absorb its aroma, as in traditional
jasmine tea Jasmine tea ( or ) is tea scented with the aroma of jasmine blossoms. Typically, jasmine tea has green tea as the tea base; however, white tea and black tea are also used. The resulting flavour of jasmine tea is subtly sweet and highly fragra ...
. The addition of milk to tea in Europe was first mentioned in 1680 by the epistolist
Madame de Sévigné Madame may refer to: * Madam, civility title or form of address for women, derived from the French * Madam (prostitution), a term for a woman who is engaged in the business of procuring prostitutes, usually the manager of a brothel * ''Madame'' ...
. Many teas are traditionally drunk with milk in cultures where dairy products are consumed. These include Indian
masala chai Masala chai (, ; Urdu: مصالحہ چائے, Hindi: मसाला चाय) is an Indian tea beverage made by boiling black tea in milk and water with a mixture of aromatic herbs and spices. Originating in India the beverage has gained worl ...
and British tea blends. These teas tend to be very hearty varieties of black tea which can be tasted through the milk, such as Assams, or the East Friesian blend. Milk is thought to neutralise remaining tannins and reduce acidity. The
Han Chinese The Han Chinese () or Han people (), are an East Asian ethnic group native to China. They constitute the world's largest ethnic group, making up about 18% of the global population and consisting of various subgroups speaking distinctiv ...
do not usually drink milk with tea but the
Manchus The Manchus (; ) are a Tungusic East Asian ethnic group native to Manchuria in Northeast Asia. They are an officially recognized ethnic minority in China and the people from whom Manchuria derives its name. The Later Jin (1616–1636) and ...
do, and the elite of the Qing Dynasty of the Chinese Empire continued to do so. Hong Kong-style milk tea is based on British habits.
Tibetans The Tibetan people (; ) are an East Asian ethnic group native to Tibet. Their current population is estimated to be around 6.7 million. In addition to the majority living in Tibet Autonomous Region of China, significant numbers of Tibetans liv ...
and other Himalayan peoples traditionally drink tea with milk or
yak butter Yak butter (also known as "Dri Butter" or "Su oil" bo, འབྲི་མར།, zh, 酥油) is butter made from the milk of the domestic yak (''Bos grunniens''). Many herder communities in China, India, Mongolia, Nepal, Gilgit-Baltistan Pakis ...
and salt. In Eastern European countries, Russia and Italy, tea is commonly served with lemon juice. In Poland, tea is traditionally served with a slice of lemon and is sweetened with either sugar or honey; tea with milk is called a ''bawarka'' ("
Bavaria Bavaria ( ; ), officially the Free State of Bavaria (german: Freistaat Bayern, link=no ), is a state in the south-east of Germany. With an area of , Bavaria is the largest German state by land area, comprising roughly a fifth of the total lan ...
n style") in Polish and is also widely popular. In Australia, tea with milk is known as "white tea". The order of steps in preparing a cup of tea is a much-debated topic and can vary widely between cultures or even individuals. Some say it is preferable to add the milk to the cup before the tea, as the high temperature of freshly brewed tea can denature the proteins found in fresh milk, similar to the change in taste of UHT milk, resulting in an inferior-tasting beverage. Others insist it is better to add the milk to the cup after the tea, as black tea is often brewed as close to boiling as possible. The addition of milk chills the beverage during the crucial brewing phase, if brewing in a cup rather than using a pot, meaning the delicate flavour of a good tea cannot be fully appreciated. By adding the milk afterwards, it is easier to dissolve sugar in the tea and also to ensure the desired amount of milk is added, as the colour of the tea can be observed. Historically, the order of steps was taken as an indication of class: only those wealthy enough to afford good-quality porcelain would be confident of its being able to cope with being exposed to boiling water unadulterated with milk. Higher temperature difference means faster
heat transfer Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy (heat) between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, ...
, so the earlier milk is added, the slower the drink cools. A 2007 study published in the ''European Heart Journal'' found certain beneficial effects of tea may be lost through the addition of milk.


Packaging


Tea bags

In 1907, American tea merchant Thomas Sullivan began distributing samples of his tea in small bags of silk with a drawstring. Consumers noticed they could simply leave the tea in the bag and reuse it with fresh tea. However, the potential of this distribution and packaging method would not be fully realised until later. During World War II, tea was rationed in the United Kingdom. In 1953, after rationing in the UK ended,
Yorkshire Yorkshire ( ; abbreviated Yorks), formally known as the County of York, is a historic county in northern England and by far the largest in the United Kingdom. Because of its large area in comparison with other English counties, functions have ...
-based tea manufacturer
Tetley Tetley is an English beverage manufacturer founded in 1837 in Yorkshire. It is the largest tea company in the United Kingdom and Canada, and the second largest in the United States by volume. Since 2000, Tetley has been a wholly owned subsidiar ...
launched the tea bag in the UK, and it was an immediate success. The "pyramid tea bag" (or sachet), introduced by Lipton and PG Tips/Scottish Blend in 1996, attempts to address one of the connoisseurs' arguments against paper tea bags by way of its three-dimensional
tetrahedron In geometry, a tetrahedron (plural: tetrahedra or tetrahedrons), also known as a triangular pyramid, is a polyhedron composed of four triangular faces, six straight edges, and four vertex corners. The tetrahedron is the simplest of all th ...
shape, which allows more room for tea leaves to expand while steeping. However, some types of pyramid tea bags have been criticised as being environmentally unfriendly, since their synthetic material is not as biodegradable as loose tea leaves and paper tea bags.


Loose tea

The tea leaves are packaged loosely in a canister, paper bag, or other container such as a
tea chest A tea chest is a type of wooden case originally produced and used to ship tea to the United Kingdom, Australia, and New Zealand. The conventional tea chest is a case with riveted metal edges, of approximate size . The term is now used more wid ...
. Some whole teas, such as rolled gunpowder tea leaves, which resist crumbling, are vacuum-packed for freshness in aluminised packaging for storage and retail. The loose tea is individually measured for use, allowing for flexibility and flavour control at the expense of convenience. Strainers, tea balls, tea presses, filtered teapots, and infusion bags prevent loose leaves from floating in the tea and over-brewing. A traditional method uses a three-piece lidded teacup called a
gaiwan A (; ) or () is a Chinese lidded bowl without a handle, used for the infusion of tea leaves and the consumption of tea. It was invented during the Ming dynasty. It consists of a bowl, a lid, and a saucer. History Prior to the Ming dynasty ...
, the lid of which is tilted to decant the tea into a different cup for consumption.


Compressed tea

Compressed tea Compressed tea, called tea bricks, tea cakes or tea lumps, and tea nuggets according to the shape and size, are blocks of whole or finely ground black tea, green tea, or post-fermented tea leaves that have been packed in molds and pressed in ...
(such as
pu-erh ''Pu'er'' or ''pu-erh'' is a variety of fermented tea traditionally produced in Yunnan Province, China. In the context of traditional Chinese tea production terminology, fermentation refers to microbial fermentation (called 'wet piling'), and ...
) is produced for convenience in transport, storage, and ageing. It can usually be stored longer without spoilage than loose leaf tea. Compressed tea is prepared by loosening leaves from the cake using a small knife, and steeping the extracted pieces in water. During the Tang dynasty, as described by Lu Yu, compressed tea was ground into a powder, combined with hot water, and ladled into bowls, resulting in a "frothy" mixture. In the
Song dynasty The Song dynasty (; ; 960–1279) was an imperial dynasty of China that began in 960 and lasted until 1279. The dynasty was founded by Emperor Taizu of Song following his usurpation of the throne of the Later Zhou. The Song conquered the rest ...
, the tea powder would instead be whisked with hot water in the bowl. Although no longer practiced in China today, the whisking method of preparing powdered tea was transmitted to Japan by
Zen Zen ( zh, t=禪, p=Chán; ja, text= 禅, translit=zen; ko, text=선, translit=Seon; vi, text=Thiền) is a school of Mahayana Buddhism that originated in China during the Tang dynasty, known as the Chan School (''Chánzong'' 禪宗), and ...
Buddhist Buddhism ( , ), also known as Buddha Dharma and Dharmavinaya (), is an Indian religion or philosophical tradition based on teachings attributed to the Buddha. It originated in northern India as a -movement in the 5th century BCE, and ...
monks, and is still used to prepare
matcha is finely ground powder of specially grown and processed green tea leaves, traditionally consumed in East Asia. The green tea plants used for matcha are shade-grown for three to four weeks before harvest; the stems and veins are removed during ...
in the Japanese tea ceremony. Compressed tea was the most popular form of tea in China during the Tang dynasty. By the beginning of the Ming dynasty, it had been displaced by loose-leaf tea. It remains popular, however, in the Himalayan countries and Mongolian steppes. In Mongolia, tea bricks were ubiquitous enough to be used as a form of currency. Among Himalayan peoples, compressed tea is consumed by combining it with
yak butter Yak butter (also known as "Dri Butter" or "Su oil" bo, འབྲི་མར།, zh, 酥油) is butter made from the milk of the domestic yak (''Bos grunniens''). Many herder communities in China, India, Mongolia, Nepal, Gilgit-Baltistan Pakis ...
and salt to produce butter tea.


Instant tea

"Instant tea", similar to
freeze-dried Freeze drying, also known as lyophilization or cryodesiccation, is a low temperature dehydration process that involves freezing the product and lowering pressure, removing the ice by sublimation. This is in contrast to dehydration by most conve ...
instant coffee Instant coffee is a beverage derived from brewed coffee beans that enables people to quickly prepare hot coffee by adding hot water or milk to coffee solids in powdered or crystallized form and stirring. Instant coffee solids (also called sol ...
and an alternative to brewed tea, can be consumed either hot or cold. Instant tea was developed in the 1930s, with
Nestlé Nestlé S.A. (; ; ) is a Swiss multinational food and drink processing conglomerate corporation headquartered in Vevey, Vaud, Switzerland. It is the largest publicly held food company in the world, measured by revenue and other metrics, since ...
introducing the first commercial product in 1946, while Redi-Tea debuted instant
iced tea Iced tea (or ice tea) is a form of cold tea. Though it is usually served in a glass with ice, it can refer to any tea that has been chilled or cooled. It may be sweetened with sugar or syrup. Iced tea is also a popular packaged drink that can be ...
in 1953. Additives such as chai, vanilla, honey or fruit, are popular, as is
powdered milk Powdered milk, also called milk powder, dried milk, or dry milk, is a manufactured dairy product made by evaporating milk to dryness. One purpose of drying milk is to preserve it; milk powder has a far longer shelf life than liquid milk and do ...
. During the Second World War British and Canadian soldiers were issued an instant tea known as "compo" in their composite ration packs. These blocks of instant tea, powdered milk, and sugar were not always well received. As Royal Canadian Artillery Gunner, George C Blackburn observed:


Bottled and canned tea

Canned tea is sold prepared and ready to drink. It was introduced in 1981 in Japan. The first bottled tea was introduced by an Indonesian tea company, PT. Sinar Sosro in 1969 with the brand name Teh Botol Sosro (or Sosro bottled tea). In 1983, Swiss-based Bischofszell Food Ltd. was the first company to bottle iced tea on an industrial scale.


Tea culture

Tea is the second most consumed beverage on Earth, after water. In many cultures it is consumed at elevated social events, such as the
tea party A tea party is a social gathering event held in the afternoon. For centuries, many societies have cherished drinking tea with a company at noon. Tea parties are considered for formal business meetings, social celebrations or just as an afternoon ...
. Tea ceremonies have arisen in different cultures, such as the Chinese and
Japanese Japanese may refer to: * Something from or related to Japan, an island country in East Asia * Japanese language, spoken mainly in Japan * Japanese people, the ethnic group that identifies with Japan through ancestry or culture ** Japanese diaspor ...
traditions, each of which employs certain techniques and ritualised protocol of brewing and serving tea for enjoyment in a refined setting. One form of Chinese tea ceremony is the
Gongfu tea ceremony The gongfu tea ceremony or kung fu tea ceremony ( or ), is a type of Chinese tea ceremony, involving the ritual preparation and presentation of tea. It is probably based on the tea preparation approaches originated in Fujian and the Chaoshan area ...
, which typically uses small
Yixing clay teapot Yixing clay teapots (), also called Zisha teapot (), are made from Yixing clay. This traditional style commonly used to brew tea originated in China, dating back to the 15th century, and are made from clay produced near Yixing in the eastern ...
s and oolong tea. In the United Kingdom, 63% of people drink tea daily. It is customary for a host to offer tea to guests soon after their arrival. Tea is consumed both at home and outside the home, often in cafés or tea rooms.
Afternoon tea Tea (in reference to food, rather than the drink) has long been used as an umbrella term for several different meals. English writer Isabella Beeton, whose books on home economics were widely read in the 19th century, describes meals of va ...
with cakes on fine porcelain is a cultural stereotype. In southwest England, many cafés serve a cream tea, consisting of scones,
clotted cream Clotted cream ( kw, dehen molys, sometimes called scalded, clouted, Devonshire or Cornish cream) is a thick cream made by heating full-cream cow's milk using steam or a water bath and then leaving it in shallow pans to cool slowly. During this t ...
, and jam alongside a pot of tea. In some parts of Britain and India, 'tea' may also refer to the evening meal. Ireland, as of 2016, was the second-biggest per capita consumer of tea in the world. Local blends are the most popular in Ireland, including
Irish breakfast tea Irish breakfast tea is a blend of several black teas, most often a combination of Assam teas and Ceylon teas. Irish tea brands, notably Barry's, Bewley's, Lyons and Robert Roberts in the Republic and Nambarrie's and Thompson's Punjana in North ...
, using Rwandan, Kenyan and Assam teas. The annual national average of tea consumption in Ireland is 2.7 kg to 4 kg per person. Tea in Ireland is usually taken with milk or sugar and brewed longer for a stronger taste.
Turkish tea Tea ( ) is a popular drink throughout Turkey and the Turkish diaspora. Turkey has the highest per capita tea consumption in the world with an annual total consumption of close to 7 pounds per person. Turkey is a large exporter of tea, ranking fif ...
is an important part of that country's cuisine and is the most commonly consumed hot drink, despite the country's long history of coffee consumption. In 2004, Turkey produced 205,500 tonnes of tea (6.4% of the world's total tea production), which made it one of the largest tea markets in the world, with 120,000 tons being consumed in Turkey and the rest being exported.''About Turkey: Geography, Economics, Politics, Religion and Culture'', Rashid and Resit Ergener, Pilgrims' Process, 2002, , p. 41 In 2010, Turkey had the highest per capita consumption in the world at 2.7 kg. As of 2013, the per-capita consumption of Turkish tea exceeds 10 cups per day and 13.8 kg per year. Tea is grown mostly in
Rize Province Rize Province ( tr, Rize ili) is a province of northeast Turkey, on the eastern Black Sea coast between Trabzon and Artvin. The province of Erzurum is to the south. It was formerly known as Lazistan, the designation of the term of Lazistan was o ...
on the Black Sea coast. Russia has a long, rich tea history dating to 1638 when tea was introduced to Tsar Michael. Social gatherings were considered incomplete without tea, which was traditionally brewed in a samovar. In Pakistan, both black and green teas are popular and are known locally as ''sabz chai'' and ''
kahwah Kahwah (also transliterated as qehwa, kehwa or kahwa) is a traditional preparation of green tea (''Camellia sinensis'') widely consumed in India, Pakistan, Afghanistan, Iran, some regions of Central Asia. Preparation The Kashmiri kahwah is ma ...
'', respectively. The popular green tea is often served after every meal in the
Pashtun Pashtuns (, , ; ps, پښتانه, ), also known as Pakhtuns or Pathans, are an Iranian ethnic group who are native to the geographic region of Pashtunistan in the present-day countries of Afghanistan and Pakistan. They were historically re ...
belt of
Balochistan Balochistan ( ; bal, بلۏچستان; also romanised as Baluchistan and Baluchestan) is a historical region in Western and South Asia, located in the Iranian plateau's far southeast and bordering the Indian Plate and the Arabian Sea coastline. ...
and in
Khyber Pakhtunkhwa Khyber Pakhtunkhwa (; ps, خېبر پښتونخوا; Urdu, Hindko: خیبر پختونخوا) commonly abbreviated as KP or KPK, is one of the Administrative units of Pakistan, four provinces of Pakistan. Located in the Geography of Pakistan, ...
. In central and southern Punjab and the metropolitan Sindh region of Pakistan, tea with milk and sugar (sometimes with pistachios, cardamom, etc.), commonly referred to as ''chai'', is widely consumed. It is the most common beverage of households in the region. In the northern Pakistani regions of Chitral and Gilgit-Baltistan, a salty, buttered Tibetan-style tea is consumed. Indian tea culture is strong; the drink is the most popular hot beverage in the country. It is consumed daily in almost all houses, offered to guests, consumed in high amounts in domestic and official surroundings, and is made with the addition of milk with or without spices, and usually sweetened. It is sometimes served with biscuits to be dipped in the tea and eaten before consuming the tea. More often than not, it is drunk in "doses" of small cups (referred to as "cutting" chai if sold at street tea vendors) rather than one large cup. Iranians have one of the highest per-capita rates of tea consumption in the world and a '' Châikhâne''(
Tea House A teahouse (mainly Asia) or tearoom (also tea room) is an establishment which primarily serves tea and other light refreshments. A tea room may be a room set aside in a hotel especially for serving afternoon tea, or may be an establishment wh ...
) is a common sight on Iranian streets. Due to the suitable climate, tea is usually cultivated in large areas of
northern Iran Northern Iran consists of the southern border of the Caspian Sea and the Alborz mountains. It includes the provinces of Gilan, Mazandaran, and Golestan. (Ancient kingdom of Hyrcania, medieval region of Tabaristan). The major provinces, Gilan ...
along the shores of the
Caspian Sea The Caspian Sea is the world's largest inland body of water, often described as the world's largest lake or a full-fledged sea. An endorheic basin, it lies between Europe and Asia; east of the Caucasus, west of the broad steppe of Central Asia ...
. In Burma (
Myanmar Myanmar, ; UK pronunciations: US pronunciations incl. . Note: Wikipedia's IPA conventions require indicating /r/ even in British English although only some British English speakers pronounce r at the end of syllables. As John Wells explai ...
), tea is consumed not only as hot drinks, but also as sweet tea and green tea known locally as ''laphet-yay'' and ''laphet-yay-gyan'', respectively. Pickled tea leaves, known locally as '' lahpet'', are also a national delicacy. Pickled tea is usually eaten with roasted sesame seeds, crispy fried beans, roasted peanuts and fried garlic chips. In Mali,
gunpowder tea Gunpowder tea (; pronounced ) is a form of tea in which each leaf has been rolled into a small round pellet. Its English name comes from its resemblance to grains of gunpowder. This rolling method of shaping tea is most often applied either to d ...
is served in series of three, starting with the highest oxidisation or strongest, unsweetened tea, locally referred to as "strong like death", followed by a second serving, where the same tea leaves are boiled again with some sugar added ("pleasant as life"), and a third one, where the same tea leaves are boiled for the third time with yet more sugar added ("sweet as love"). Green tea is the central ingredient of a distinctly Malian custom, the "Grin", an informal social gathering that cuts across social and economic lines, starting in front of family compound gates in the afternoons and extending late into the night, and is widely popular in
Bamako Bamako ( bm, ߓߡߊ߬ߞߐ߬ ''Bàmakɔ̌'', ff, 𞤄𞤢𞤥𞤢𞤳𞤮 ''Bamako'') is the capital and largest city of Mali, with a 2009 population of 1,810,366 and an estimated 2022 population of 2.81 million. It is located on the Niger Rive ...
and other large urban areas. In the United States, 80% of tea is consumed as
iced tea Iced tea (or ice tea) is a form of cold tea. Though it is usually served in a glass with ice, it can refer to any tea that has been chilled or cooled. It may be sweetened with sugar or syrup. Iced tea is also a popular packaged drink that can be ...
. Sweet tea is native to the southeastern U.S. and is iconic in its cuisine. File:Turkish tea2.jpg,
Turkish tea Tea ( ) is a popular drink throughout Turkey and the Turkish diaspora. Turkey has the highest per capita tea consumption in the world with an annual total consumption of close to 7 pounds per person. Turkey is a large exporter of tea, ranking fif ...
served in a typical small glass and corresponding plate File:English_teaware.jpg, English teaware File:Iced Tea from flickr.jpg, upright=0.8,
Iced tea Iced tea (or ice tea) is a form of cold tea. Though it is usually served in a glass with ice, it can refer to any tea that has been chilled or cooled. It may be sweetened with sugar or syrup. Iced tea is also a popular packaged drink that can be ...
with a slice of lemon File:South Indian tea (5399611578).jpg, Indian Masala tea


Economics

Tea is the most popular manufactured drink consumed in the world, equaling all others – including coffee, soft drinks, and alcohol – combined. Most tea consumed outside East Asia is produced on large plantations in the hilly regions of India and Sri Lanka and is destined to be sold to large businesses. Opposite this large-scale industrial production are many small "gardens," sometimes minuscule plantations, that produce highly sought-after teas prized by gourmets. These teas are both rare and expensive and can be compared to some of the most expensive wines in this respect. India is the world's largest tea-drinking nation, although the per capita consumption of tea remains a modest per person every year. Turkey, with of tea consumed per person per year, is the world's greatest per capita consumer.


Labor and consumer safety problems

Tests of commercially popular teas have detected residues of banned toxic pesticides. Tea production in Kenya, Malawi, Rwanda, Tanzania, and Uganda has been reported to make use of
child labor Child labour refers to the exploitation of children through any form of work that deprives children of their childhood, interferes with their ability to attend regular school, and is mentally, physically, socially and morally harmful. Such e ...
according to the
U.S. Department of Labor The United States Department of Labor (DOL) is one of the United States federal executive departments, executive departments of the federal government of the United States, U.S. federal government. It is responsible for the administration of fede ...
's '' List of Goods Produced by Child Labor or Forced Labor.'' Workers who pick and pack tea on plantations in developing countries can face harsh working conditions and may earn below the
living wage A living wage is defined as the minimum income necessary for a worker to meet their basic needs. This is not the same as a subsistence wage, which refers to a biological minimum, or a solidarity wage, which refers to a minimum wage tracking lab ...
.


Certification

Several bodies independently certify the production of tea, such as Rainforest Alliance, Fairtrade, UTZ Certified, and Organic. From 2008 to 2016, sustainability standards-certified tea production experienced a compound annual growth rate of about 35%, accounting for at least 19% of overall tea production. In 2016, at least 1.15 million tonnes of sustainably certified tea was produced, valued at US$2 billion. Rainforest Alliance certified tea is sold by Unilever brands Lipton and PG Tips in Western Europe, Australia and the U.S. Fairtrade certified tea is sold by a large number of suppliers around the world. UTZ Certified tea is sold by Pickwick tea. Production of organic tea has risen since its introduction in 1990 at Rembeng, Kondoli Tea Estate, Assam. tons of organic tea were sold in 1999.United Nations. Economic and Social Commission for Asia and the Pacific (2002). ''Organic Agriculture and Rural Poverty Alleviation: Potential and Best Practices in Asia''. United Nations Publications. pp. 62–63.


See also

* Cannabis tea * Chifir', Russian extra-strong tea brew *
Herbal tea Herbal teas, also known as herbal infusions and less commonly called tisanes (UK and US , US also ), are beverages made from the infusion or decoction of herbs, spices, or other plant material in hot water. Oftentimes herb tea, or the plain term ...
* Frederick John Horniman * Indian Tea Association * International Tea Day * ISO 3103 *
Kombucha Kombucha (also tea mushroom, tea fungus, or Manchurian mushroom when referring to the culture; Latin name ''Medusomyces gisevii'') is a fermented, lightly effervescent, sweetened black tea drink commonly consumed for its purported health b ...
, drink produced from bacteria and yeast grown on tea *
List of Chinese teas This is a list of Chinese teas. Chinese tea is a beverage made from the leaves of tea plants (''Camellia sinensis'') and – depending on the type of tea – typically 60–100 °C hot water. Tea leaves are processed using traditional Chi ...
*
List of hot beverages This list of hot drinks comprises drinks that are typically served hot. Drinks are liquids specifically prepared for human consumption. __TOC__ Hot drinks Indonesia India There are many hot beverages that originated from India that have gai ...
*
List of national drinks A national drink is a distinct beverage that is strongly associated with a particular country, and can be part of their national identity and self-image. National drinks fall into two categories: alcoholic and non-alcoholic. An alcoholic national ...
*
List of tea companies This is a list of Wikipedia articles on companies that produce or distribute tea. * Global * Lipton (Unilever) * Tetley ( Tata Global Beverages) * Twinings ( Associated British Foods) Australia * Dilmah * Bushells and Lipton ( Unilever Au ...
*
Peace Iced Tea Peace Iced Tea (often labeled Peace Tea) is a brand of assorted iced tea beverages produced by the Coca-Cola Company. It was originally produced by the Monster Beverage Company. The product launched on December 21, 2007. Peace Tea contains no ...
* Phenolic content in tea * Tea classics, influential historical monographs of East Asian tea *
Tea leaf grading In the tea industry, tea leaf grading is the process of evaluating products based on the quality and condition of the tea leaves themselves. The highest grades for Western and South Asian teas are referred to as "orange pekoe", and the lowest ...
*
Tea strainer A tea strainer is a type of strainer that is placed over or in a teacup to catch loose tea leaves. When tea is brewed in the traditional manner in a teapot, the tea leaves are not contained in teabags; rather, they are freely suspended in ...
* Tea tasting


References


Citations


General sources

* * * * {{Authority control Chinese cuisine Crops originating from China Herbal and fungal stimulants Victorian cuisine