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mercuric sulfide

or mercury sulfide

noun, Chemistry.
a crystalline, water-insoluble, poisonous compound, HgS, occurring as a coarse, black powder (black mercuric sulfide) or as a fine, bright-scarlet powder (red mercuric sulfide) used chiefly as a pigment and as a source of the free metal. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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