sodium metabisulfite food grade purity of 97% Min use for Bleaching agent,loosening agent,corrosion protection antiseptic,anti sodium metabisulfite food gradeinspection itemstandardinspection resultconclusion ... antiseptic(fruit juice, can,etc ), antioxidant(for lily flower, sea food, fruit, vetegable,etc ) . Packing: external polypropylene woven bag, polyethylene plastic ...