Lead-glazed earthenware is one of the traditional types of

earthenware Earthenware is glazed or unglazed nonvitreous pottery that has normally been fired below . Basic earthenware, often called terracotta, absorbs liquids such as water. However, earthenware can be made impervious to liquids by coating it with a c ...

with a

ceramic glaze Ceramic glaze is an impervious layer or coating of a vitreous substance which has been fused to a pottery body through firing. Glaze can serve to color, decorate or waterproof an item. Glazing renders earthenware vessels suitable for holding ...

, which coats the ceramic

biscuit A biscuit is a flour-based baked and shaped food product. In most countries biscuits are typically hard, flat, and unleavened. They are usually sweet and may be made with sugar, chocolate, icing, jam, ginger, or cinnamon. They can also be s ...

body and renders it impervious to liquids, as

terracotta Terracotta, terra cotta, or terra-cotta (; ; ), in its material sense as an earthenware substrate, is a clay-based unglazed or glazed ceramic where the fired body is porous. In applied art, craft, construction, and architecture, terra ...

itself is not. Plain lead glaze is shiny and transparent after firing. Coloured lead glazes are shiny and either translucent or opaque after firing. Three other traditional techniques are

tin-glazed Tin-glazing is the process of giving tin-glazed pottery items a ceramic glaze that is white, glossy and opaque, which is normally applied to red or buff earthenware. Tin-glaze is plain lead glaze with a small amount of tin oxide added.Caiger-Smith ...

(in fact this is lead glaze with a small amount of tin added), which coats the ware with an opaque white glaze suited for overglaze brush-painted colored enamel designs; salt glaze pottery, also often

stoneware Stoneware is a rather broad term for pottery or other ceramics fired at a relatively high temperature. A modern technical definition is a vitreous or semi-vitreous ceramic made primarily from stoneware clay or non-refractory fire clay. Whether vi ...

; and the feldspathic glazes of Asian

porcelain Porcelain () is a ceramic material made by heating substances, generally including materials such as kaolinite, in a kiln to temperatures between . The strength and translucence of porcelain, relative to other types of pottery, arises main ...

. Modern materials technology has invented new vitreous glazes that do not fall into these traditional categories. In lead glazes, tints provided by impurities render greenish to brownish casts, with aesthetic possibilities that are not easily controlled in the kiln. The Romans used lead glazes for high-quality oil lamps and drinking cups. At the same time in China,

green-glazed pottery Green-glazed pottery () was a type of colored pottery developed in China during the Eastern Han period (25–220 CE). The body of green-glazed pottery ceramics was made of clay, coated with a layer of glaze, and fired at a temperature of 800 degre ...

dating back to the Han period (25–220 AD) gave rise eventually to the '' sancai'' ('three-color')

Tang Dynasty The Tang dynasty (, ; zh, t= ), or Tang Empire, was an Dynasties in Chinese history, imperial dynasty of China that ruled from 618 to 907 AD, with an Zhou dynasty (690–705), interregnum between 690 and 705. It was preceded by the Sui dyn ...

ceramics, where the white clay body was coated with coloured glazes and fired at a temperature of 800 degrees C.

Lead oxide Lead oxides are a group of inorganic compounds with formulas including lead (Pb) and oxygen (O). Common lead oxides include: * Lead(II) oxide, PbO, litharge (red), massicot (yellow) * Lead(II,IV) oxide Lead(II,IV) oxide, also called red lead o ...

was the principal

flux Flux describes any effect that appears to pass or travel (whether it actually moves or not) through a surface or substance. Flux is a concept in applied mathematics and vector calculus which has many applications to physics. For transport ...

in the glaze.

Polychrome Polychrome is the "practice of decorating architectural elements, sculpture, etc., in a variety of colors." The term is used to refer to certain styles of architecture, pottery or sculpture in multiple colors. Ancient Egypt Colossal statu ...

effects (i.e. the colours) were obtained by using the oxides of

copper Copper is a chemical element with the symbol Cu (from la, cuprum) and atomic number 29. It is a soft, malleable, and ductile metal with very high thermal and electrical conductivity. A freshly exposed surface of pure copper has a pink ...

(which turns green),

iron Iron () is a chemical element with symbol Fe (from la, ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is, by mass, the most common element on Earth, right in ...

(brownish yellow), and less often

manganese Manganese is a chemical element with the Symbol (chemistry), 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 ...

(brown) and

cobalt Cobalt is a chemical element with the symbol Co and atomic number 27. As with nickel, cobalt is found in the Earth's crust only in a chemically combined form, save for small deposits found in alloys of natural meteoric iron. The free element, p ...

(blue). Much of Roman technology was lost in the West, but coarse lead-glazed earthenwares were universal in medieval Europe and in

Colonial America The colonial history of the United States covers the history of European colonization of North America from the early 17th century until the incorporation of the Thirteen Colonies into the United States after the Revolutionary War. In the ...

. In England, lead-glazed Stamford ware was produced in

Stamford, Lincolnshire Stamford is a town and civil parish in the South Kesteven District of Lincolnshire, England. The population at the 2011 census was 19,701 and estimated at 20,645 in 2019. The town has 17th- and 18th-century stone buildings, older timber-framed ...

as early as the ninth century. It was widely traded across Britain and the near continent. In Italy during the 15th century lead-glazed wares were improved by the incremental addition of tin oxides under the influence of Islamic wares imported through Sicily, giving rise to

maiolica Maiolica is tin-glazed pottery decorated in colours on a white background. Italian maiolica dating from the Renaissance period is the most renowned. When depicting historical and mythical scenes, these works were known as ''istoriato'' wares ...

, which supplanted lead-glazed wares in all but the most rustic contexts. The French 16th-century

Saint-Porchaire ware Saint-Porchaire ware is the earliest very high quality French pottery. It is white lead-glazed earthenware often conflated with true faience, that was made for a restricted French clientele from perhaps the 1520s to the 1550s. Only about seventy ...

is lead-glazed earthenware; an early European attempt at rivalling Chinese porcelains, it does not properly qualify as

faience Faience or faïence (; ) is the general English language term for fine tin-glazed pottery. The invention of a white pottery glaze suitable for painted decoration, by the addition of an oxide of tin to the slip of a lead glaze, was a major ...

, which is a refined tin-glazed earthenware. In 16th-century France Bernard Palissy refined lead-glazed earthenware to a high standard. Victorian majolica is predominantly lead-glazed ' majolica' earthenware, introduced by

Mintons Mintons was a major company in Staffordshire pottery, "Europe's leading ceramic factory during the Victorian era", an independent business from 1793 to 1968. It was a leader in ceramic design, working in a number of different ceramic bodies, ...

in the mid-19th century as a revival of "

Palissy ware Palissy ware is a 19th-century term for ceramics produced in the style of the famous French potter Bernard Palissy (c. 1510–90), who referred to his own work in the familiar manner as ("in the rustic style"). It is therefore also known as rust ...

". Victorian majolica also include Minton's rare tin-glaze products.Pottery, British Manufacturing Industries, Leon Arnoux, 1877, p.42 Pearlware Toby jug VA C42-1955

Lead-glazed earthenwares in Britain include the Toby jugs, such as those made in the late 18th century by Ralph Wood the Younger at Burslem, Staffordshire.

Notes

References

* Atterbury, Paul, and Batkin, Maureen, ''Dictionary of Minton'', Antique Collectors' Club, 1990. * Arnoux, Leon, ''British Manufacturing Industries, Gutenberg, 1877

External links

{{wiktionary, Majolica
The Majolica Society
Ceramic glazes Pottery

See also

Notes

References

External links