chrome alum


noun

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.
a violet, crystalline, water-soluble powder, potassium chromium sulfate, CrK(SO4)2⋅12H2O, used chiefly as a mordant in dyeing.

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British Dictionary definitions for chrome alum

chrome alum

noun

a violet-red crystalline substance, used as a mordant in dyeing. Formula: KCr(SO 4) 2 .12H 2 O
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