Orpiment
Orpiment , noun
[French, from Latin auripigmentum; aurum gold + pigmentum pigment. Compare Aureate, Pigment, Orpin, Orpine.]
(Chemistry) Arsenic sesquisulphide, produced artificially as an amorphous lemon-yellow powder, and occurring naturally as a yellow crystalline mineral; -- formerly called auripigment. It is used in king's yellow, in white Indian fire, and in certain technical processes, as indigo printing.
Our orpiment and sublimed mercurie.
Collocations (2)
Red orpiment , realgar; the red sulphide of arsenic.
Yellow orpiment , king's yellow.