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Kaolinite (/ ˈ k eɪ. ə l ə ˌ n aɪ t,-l ɪ-/ KAY-ə-lə-nyte, -lih-; also called kaolin) [5] [6] [7] is a clay mineral, with the chemical composition Al 2 Si 2 O 5 4.It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO 4) linked through oxygen atoms to one octahedral sheet of alumina (AlO 6).
It was composed of white clay containing powdered feldspar, calcium phosphate and wollastonite (CaSiO 3 ), with quartz . [ 10 ] [ 11 ] Other early European soft-paste porcelain, also a frit porcelain, was produced at the Rouen manufactory in 1673, which was known for this reason as "Porcelaine française". [ 12 ]
Both men and women from the upper classes used white or tinted powders to style wigs or their natural hair. Hair powder usage began to decline after the French Revolution, as more natural hairstyles came into vogue, and taxes on hair powder were introduced. [4] Short Hair styled with hair texture powder
Clay is a type of fine-grained natural soil material containing clay minerals [1] (hydrous aluminium phyllosilicates, e.g. kaolinite, Al 2 Si 2 O 5 4). Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. [2] [3]
Venetian ceruse or Venetian white, [2] also known as blanc de céruse de Venise [3] and Spirits of Saturn, [4] was a 16th-century cosmetic used as a skin whitener. It was in great demand and considered the best available at the time, supposedly containing the best quality white lead sourced from Venice , the global merchant capital at the time.
They are now manufactured using natural pigments (iron oxides, carbon black, titanium dioxide), clay , and a binder (cellulose ether). [2] Conté crayons are most commonly found in black, white, and sanguine tones, as well as bistre, shades of grey, and other colors. Colors sets are especially useful for field studies and color studies.
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Montmorillonite, a member of the smectite group, is a 2:1 clay, meaning that it has two tetrahedral sheets of silica sandwiching a central octahedral sheet of alumina. The particles are plate-shaped with an average diameter around 1 μm and a thickness of 0.96 nm ; magnification of about 25,000 times, using an electron microscope, is required ...
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