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Webster 1913 Edition
Orpiment
Or′pi-ment
,Noun.
(Chem.)
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.
Webster 1828 Edition
Orpiment
OR'PIMENT
,Noun.
Sulphuret of arsenic, found native and then an ore of arsenic, or artificially composed. The native orpiment appears in yellow, brilliant and seemingly talcky masses of various sizes. The red orpiment is called realgar. It is more or less lively and transparent, and often crystallized in bright needles. In this form it is called ruby of arsenic.