Description CAS#: 7788-99-0 | Formula: CrK(SO4)2.12H2O | Specifications: Aluminum 0.02 % Max, Ammonium 0.01 % Max, Assay 98.0 - 102.0 %, Chloride 0.002 % Max, Heavy metals (Pb) 0.01 % Max, Insoluble 0.01 % Max, Iron 0.01 % Max