chrome alum

an alum of which one of the components is chromium; esp., potassium chromium sulfate, KCr(SO)·12HO, used in tanning and dyeing

See chrome alum in American Heritage Dictionary 4

noun

A violet-red crystalline compound, CrK(SO₄)₂·12H₂O, used in tanning, as a mordant, and in photography.

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