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for Red orpiment
From The Collaborative International Dictionary of English v.0.48 :
Orpiment \Or"pi*ment\, n. [F., fr. L. auripigmentum; aurum gold
+ pigmentum pigment. Cf. Aureate, Pigment, Orpin,
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. --Chaucer.
Red orpiment, realgar; the red sulphide of arsenic.
Yellow orpiment, king's yellow.
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