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- ...formerly used as painting pigments. Other sulfides include [[tetraarsenic trisulfide|As<sub>4</sub>S<sub>3</sub>]] and and As<sub>4</sub>S<sub>10</sub>. Arseni ...rst to isolate the element in 1250 by heating soap together with [[arsenic trisulfide]].<ref name="BuildingBlocks451-3"/> In 1649, [[Johann Schröder]] published51 KB (7,314 words) - 21:34, 20 September 2010