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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World English Dictionary
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Chrome alum is always a great word to know.
So is slumgullion. Does it mean:
a scrap or morsel of food left at a meal.
a stew of meat, vegetables, potatoes, etc.
Example sentences
He added small amounts of chrome alum and acetone to the rather odd substance in order to turn it into gelatin.
The chrome alum solution is clarified and fed to the electrolysis cell.
The slurry is filtered, and the chrome alum is dissolved in hot water.
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