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Realgar (/ r i ˈ æ l ɡ ɑːr,-ɡ ər / ree-AL-gar, -gər), also known as arsenic blende, ruby sulphur or ruby of arsenic, is an arsenic sulfide mineral with the chemical formula α-As 4 S 4. It is a soft, sectile mineral occurring in monoclinic crystals, or in granular, compact, or powdery form, often in association with the related ...
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Pararealgar is an arsenic sulfide mineral with the chemical formula As 4 S 4, [3] also represented as AsS. [5] It forms gradually from realgar under exposure to light. Its name derives from the fact that its elemental composition is identical to realgar, As 4 S 4.
Walter Thomas Foster (1891–1981) was an American entrepreneur, artist, art instructor, writer, editor and publisher. The Walter Foster Publishing Company's line of low-cost art manuals were widely distributed to art stores, often displayed in a metal rack specially made for Foster's oversized art books.
Upon his return to Saint Petersburg in 1869, he presented two large paintings with several portraits and watercolors and was appointed a Professor of history and portrait painting at the Academy, a position he held for twenty years. [2] The following year, he created decorations on themes from Russian folk poetry in the palace of Grand Duke ...