American Heritage® Dictionary of the English Language, Fourth Edition
- n. A violet-red crystalline compound, CrK(SO4)2·12H2O, used in tanning, as a mordant, and in photography.
Century Dictionary and Cyclopedia
- n. A erystallizable double salt (K2SO4 + Cr2(SO4)3 + 24H2O) formed of the sulphates of chromium and potassium: a by-product in the manufacture of artificial alizarin, used in dyeing and calico-printing.
GNU Webster's 1913
- n. (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.
- n. a violet-colored salt used in hide tanning and as a mordant in dyeing
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