Orpiment /(?)/

Or·pi·ment

Orpiment

n.
  1. 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. (Chem.)
    Our orpiment and sublimed mercurie.

Phrases & Compounds
Red orpiment
realgar; the red sulphide of arsenic.
Yellow orpiment
king's yellow.