sodium sulfide

noun Chemistry.
a yellow or brick-red, crystalline, deliquescent, water-soluble solid, Na 2 S, 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.
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The conventional dehairing agent has been sodium sulfide, but safer, environmentally benign alternatives are needed.
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