(tetraarsenic tetrasulfide) [As4
] reddish-orange powder
Realgar has been used in dark prime (as a color change relay) and occasionally to make "red explosive," a contact or impact explosive used, for instance, in torpedoes. Rarely used in the US, occasionally continues to be used by some oriental manufacturers. For historical information on additional uses, see Dr. Robert Winokur's article on orpiment and realgar formulations. Very limited quantity available, and may not be something we can keep in stock.
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