... green granular crystal, Uniform color, No agglomeration 1000 tons per year welcome to our factory green nickel sulfate crystals / nickel sulfate/ nickel salt ... materials asylum leakage PropertiesNiSO4.6H2O Test MethodAppearanceEmerald green granular crystal, uniform color, no agglomeration, uncontaminatedVisual InspectionNi≥ ... insoluble≤0.03%GB11901-1989 Granular crystal/ Nickel Sulfate/ uncontainated