highi-purity emerald green granular crystal, uniform color, no agglomeration uncontaminated welcome to ... Nickel Sulfate Nickel sulfate hexahydrateNickel salt PropertiesNiSO4.7H2O Test MethodAppearanceEmerald green granular crystal, uniform color, no agglomeration, uncontaminatedVisual InspectionNi≥21. ... provided if needed, welcome to visit our factory! Emerald green granular crystal, nickel sulfate