Dictionary  so'dium sul'fideChem. a yellow or brick-red, crystalline, deliquescent, water-soluble solid, Na2S, used chiefly in the manufacture of dyes, soaps, and rubber, as a depilatory for leather, and in the flotation of powdered lead and copper ores. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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