from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Arsenic trisulfide, As2S3, a yellow mineral used as a pigment.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. arsenic trisulphide, occurring naturally in crystals or massive deposits, formerly used as a dye or pigment
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. Arsenic trisulphid, As2S3.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a yellow mineral occurring in conjunction with realgar; an ore of arsenic
Even so, the words do not agitate the meth-addled hamsters that operate my mental machinery to the extent that 'orpiment' does.
Several other, less-common minerals contain arsenic, including orpiment, realgar, and enargite, which are arsenic sulfides.
It is believed that he heated soap and orpiment together and isolated elemental arsenic.
The name arsenic comes from the Greek word arsenikon, which means orpiment.
This was possible by altering the coloring material through the addition of orpiment, which slowed reaction time.
King's yellow is a pure orpiment, or arsenic coloured with sulphur ...
As for the mineral colors, sulfur is an essential ingredient of such colors as orpiment and cinnabar, and it can never be removed.
Zirník or orpiment, 3 parts: it is applied in the Hammam to a perspiring skin, and it must be washed off immediately the hair is loosened or it burns and discolours.
Purity, however, was only a goal in the case of pigments made of potentially dangerous materials: If sulfur could not be removed from orpiment, or copper from verdigris, purification might at least render them less harmful.
"Pencil blue" was made by heating finely ground indigo with orpiment and potash.