Sodium gluconate is white or light yellow crystalline powder; Easily soluble in water, insoluble in alcohols; Has salty ... dyeing industries. Item Food grade Identifications Meet the specifications Purity, % 98.0-101 Drying loss, % ≤ 0.30 Heavy metal, μg/g ... .03 Chloride, % ≤ 0.03 Reduzate, % ≤ 0.30 Tech grade gluconate 98%