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mercu'ric sul'fide

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. Also,mercury sulfide.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

mercuric oxidemercurify


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