orpiment

Arsenic trisulfide, As₂S₃, a yellow mineral used as a pigment.

Arsenic trisulphid, As₂S₃.

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.

realgar; the red sulphide of arsenic.

king’s yellow.

arsenic trisulphide, occurring naturally in crystals or massive deposits, formerly used as a dye or pigment

a yellow mineral occurring in conjunction with realgar; an ore of arsenic