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Green Earth
Green earth, also known as terre verte and Verona green, is an inorganic pigment derived from the minerals celadonite and glauconite. Its chemical formula is .Common Medieval Pigments d-scholarship.pitt.edu. Retrieved August 29, 2016. First used by the ancient Romans, green earth has been identified on wall paintings at and Dura-Europos.Terre Verte. https://www.library.cornell.edu/preservation/paper/4PigAtlasWestern1.pdf. Retrieved August 30, 2016. The Renaissance painter and writer Cennino Cennin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Derwent Cumberland Pencil Company
Derwent (formerly the "Cumberland Pencil Company") is a brand of pencils, art materials, and other stationery. The business began in 1832 in Cumberland Cumberland ( ) is a historic counties of England, historic county in the far North West England. It covers part of the Lake District as well as the north Pennines and Solway Firth coast. Cumberland had an administrative function from the 12th c ... under the name of "Banks, Son & Co". The company was bought by US corporation ACCO Brands (known then as Rexel) in 1980, and became a brand of their product range. on ACCO website (11 Oct 2020) History Keswick remained well known for producing the finest pencils in the world. Previously the pencils had been made by hand in small workshops, but in 1832, the first pencil factory in the area was opened by 'Banks, Son & Co'. This com ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pigment
A pigment is a colored material that is completely or nearly insoluble in water. In contrast, dyes are typically soluble, at least at some stage in their use. Generally dyes are often organic compounds whereas pigments are often inorganic compounds. Pigments of prehistoric and historic value include ochre, charcoal, and lapis lazuli. Economic impact In 2006, around 7.4 million tons of inorganic, organic, and special pigments were marketed worldwide. Estimated at around US$14.86 billion in 2018 and will rise at over 4.9% CAGR from 2019 to 2026. The global demand for pigments was roughly US$20.5 billion in 2009. According to an April 2018 report by '' Bloomberg Businessweek'', the estimated value of the pigment industry globally is $30 billion. The value of titanium dioxide – used to enhance the white brightness of many products – was placed at $13.2 billion per year, while the color Ferrari red is valued at $300 million each year. Physical princip ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Celadonite
Celadonite is a mica group mineral, a phyllosilicate of potassium, iron in both oxidation states, aluminium and hydroxide with formula . It crystallizes in the monoclinic system and usually forms massive aggregates of prismatic crystallites or in dull clay masses. It is soft with a Mohs hardness of 2 and a specific gravity of 3. Typically occurs as dull gray-green to bluish green masses. It forms vesicle fillings and linings in altered basaltic lavas. It was first described in 1847 on Monte Baldo, near Verona, Italy. The name is from the French ''celadon,'' for sea-green. It is one of two minerals, along with glauconite, used in making the pigment known as green earth. Common impurities are manganese, calcium and sodium Sodium is a chemical element with the symbol Na (from Latin ''natrium'') and atomic number 11. It is a soft, silvery-white, highly reactive metal. Sodium is an alkali metal, being in group 1 of the periodic table. Its only stable ... (previo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glauconite
Glauconite is an iron potassium phyllosilicate (mica group) mineral of characteristic green color which is very friable and has very low weathering resistance. It crystallizes with a monoclinic geometry. Its name is derived from the Greek () meaning 'bluish green', referring to the common blue-green color of the mineral; its sheen (mica glimmer) and blue-green color. Its color ranges from olive green, black green to bluish green, and yellowish on exposed surfaces due to oxidation. In the Mohs scale it has hardness of 2. The relative specific gravity range is 2.4 - 2.95. It is normally found in dark green rounded brittle pellets, and with the dimension of a sand grain size. It can be confused with chlorite (also of green color) or with a clay mineral. Glauconite has the chemical formula . Glauconite particles are one of the main components of greensand, glauconitic siltstone and glauconitic sandstone. Glauconite has been called a marl in an old and broad sense of that wo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pompeii
Pompeii (, ) was an ancient city located in what is now the ''comune'' of Pompei near Naples in the Campania region of Italy. Pompeii, along with Herculaneum and many villas in the surrounding area (e.g. at Boscoreale, Stabiae), was buried under of volcanic ash and pumice in the Eruption of Mount Vesuvius in 79 AD. Largely preserved under the ash, the excavated city offered a unique snapshot of Roman life, frozen at the moment it was buried, although much of the detailed evidence of the everyday life of its inhabitants was lost in the excavations. It was a wealthy town, with a population of ca. 11,000 in AD 79, enjoying many fine public buildings and luxurious private houses with lavish decorations, furnishings and works of art which were the main attractions for the early excavators. Organic remains, including wooden objects and human bodies, were interred in the ash. Over time, they decayed, leaving voids that archaeologists found could be used as moulds to make plast ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dura-Europos Dura-Europos, ; la, Dūra Eurōpus, ( el, Δούρα Ευρωπός, Doúra Evropós, ) was a Hellenistic, Parthian, and Roman border city built on an escarpment above the southwestern bank of the Euphrates river. It is located near the village of Salhiyé, in present-day Syria. Dura-Europos was founded around 300 BC by Seleucus I Nicator, who founded the Seleucid Empire as one of the Diadochi of Alexander the Great. In 113 BC, Parthians conquered the city, and held it, with one brief Roman intermission (114 AD), until 165 AD. Under Parthian rule, it became an important provincial administrative centre. The Romans decisively captured Dura-Europos in 165 AD and great |
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