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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.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for chrome alum
Historical Examples
  • Any salt of chromium, with either mineral or organic acids, can be used, but chrome alum is the one most commonly employed.

  • In any of these methods the chrome alum liquor is suitable, using 10 per cent.

    Animal Proteins Hugh Garner Bennett
  • Iron alum (pale mauve) and chrome alum (deep purple) are compounds containing iron and chromium in place of aluminium.

  • The disadvantage of this liquor is the limited solubility of chrome alum and the need for its solution in the cold.

    Animal Proteins Hugh Garner Bennett
  • Of the first type the most common is that in which chrome alum (a bye-product of the dyeing industry) is the starting-point.

    Animal Proteins Hugh Garner Bennett
  • In dyeing with coal tar colours the alizarin colours may be used after mordanting with chrome alum.

    Animal Proteins Hugh Garner Bennett
  • For special purposes chromium fluoride, chrome alum, &c., are employed.

  • A favourite mixture consists of chrome alum and sodium carbonate (common soda).

    Leather K. J. Adcock
  • This liquor has a greater plumping effect on the leather than the chrome alum liquor has.

    Leather K. J. Adcock
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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