What is arsenic sulphide, a mineral of a brilliant red color; red orpiment. It is also an artificial product called?
realgar — Arsenic sulphide, a mineral of a brilliant red color; red orpiment. It is also an artificial product. (Webster's 1913.)
Sources
- Webster's Unabridged Dictionary, 1913 edition (public domain, via GCIDE / Project Gutenberg).
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