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What is "chrome alum"

The Collaborative International Dictionary
Chrome alum

Chrome \Chrome\, n. Same as Chromium. Chrome alum (Chem.), a dark violet substance, (SO4)3Cr2.K2SO4.24H2O, analogous to, and crystallizing like, common alum. It is regarded as a double sulphate of chromium and potassium. Chrome green

  1. The green oxide of chromium, Cr2O3, used in enamel painting, and glass staining.

  2. A pigment made by mixing chrome yellow with Prussian blue.

    Chrome red, a beautiful red pigment originally prepared from the basic chromate of lead, but now made from red oxide of lead.

    Chrome yellow, a brilliant yellow pigment, PbCrO4, used by painters.

WordNet
chrome alum

n. a violet-colored salt used in hide tanning and as a mordant in dyeing

Wikipedia
Chrome alum

Chrome alum or Chromium(III) potassium sulfate is the potassium double sulfate of chromium. Its chemical formula is KCr(SO) and it is commonly found in its dodecahydrate form as KCr(SO)ยท12(HO). It is used in leather tanning.