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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.
The Artist's Handbook of Materials and Techniques is a reference book by Ralph Mayer (1895–1979). [1] Intended by the author for use by professional artists, it deals mostly with the chemical and physical properties of traditional painterly materials such as oil, tempera, and encaustic, as well as solvents, varnishes, and painting mediums.
Bright golden-yellow streak color of orpiment Orpiment and Realgar on the same rock Orpiment is a type of lemon-yellow to golden- or brownish-yellow crystal commonly found in foliated columnar or fibrous aggregates, may alternatively be botryoidal or reniform, granular or powdery, and, rarely, as prismatic crystals . [ 7 ]
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