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chrome' al"um




1. Also called ammonium chrome alum, ammonium chromic sulfate. a green, crystalline, water-soluble powder, chromium ammonium sulfate, CrNH4(SO4)2·12H2O, used chiefly as a mordant in dyeing.
2. a violet, crystalline, water-soluble powder, potassium chromium sulfate, CrK(SO4)2·12H2O, used chiefly as a mordant in dyeing.

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

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