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black mercuric sulfide

noun, Chemistry
See under mercuric sulfide.

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. 2015.
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