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chrome alum

noun
1.
Also called ammonium chrome alum, ammonium chromic sulfate. a green, crystalline, water-soluble powder, chromium ammonium sulfate, CrNH 4 (SO 4) 2 ⋅12H 2 O, used chiefly as a mordant in dyeing.
2.
a violet, crystalline, water-soluble powder, potassium chromium sulfate, CrK(SO 4) 2 ⋅12H 2 O, used chiefly as a mordant in dyeing.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for chrome-alum

chrome alum

noun
1.
a violet-red crystalline substance, used as a mordant in dyeing. Formula: KCr(SO4)2.12H2O
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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