highi-purity emerald green granular crystal, uniform color, no agglomeration uncontaminated welcome to ... sulfate hexahydrateNickel salt PropertiesNiSO4.7H2O Test MethodAppearanceEmerald green granular crystal, uniform color, no agglomeration, uncontaminatedVisual InspectionNi≥21. ... from fire and heat sources. kept separate from water, acid, etc., avoided mixing storage. Sample would be provided ...