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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chrome alum
 
n
a violet-red crystalline substance, used as a mordant in dyeing. Formula: KCr(SO4)2.12H2O

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The slurry is filtered, and the chrome alum is dissolved in hot water.
The chrome alum solution is clarified and fed to the electrolysis cell.
He added small amounts of chrome alum and acetone to the rather odd substance in order to turn it into gelatin.
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