Highi-purity emerald green granular crystal, Uniform color, No agglomeration 1000 tons per year welcome ... appropriate materials asylum leakage PropertiesNiSO4.6H2O Test MethodAppearanceEmerald green granular crystal, uniform color, no agglomeration, uncontaminatedVisual InspectionNi≥21. 50%complexometric ... -≤ 0.020%ISEwater-insoluble≤0.03%GB11901-1989 Granular crystal/ Nickel Sulfate/ uncontainated