| 1. | Also called ammonium chrome alum, ammonium chromic sulfate. a green, crystalline, water-soluble powder, chromium ammonium sulfate, CrNH4(SO4)2·12H2O, used chiefly as a mordant in dyeing. |
| 2. | a violet, crystalline, water-soluble powder, potassium chromium sulfate, CrK(SO4)2·12H2O, used chiefly as a mordant in dyeing. |
| chrome alum n. A violet-red crystalline compound, CrK(SO4)2·12H2O, used in tanning, as a mordant, and in photography. |