Name:L-Cystine 1.Cas no.:56-89-3 2.White crystal or crystalline powder; tasteless 3.Assay 98.5~101.0 % Properties:White crystal or crystalline powder, odorless, flavorless, almost insoluble in water or ethanol, soluble in diluted acid or basic hydroxide solutions. Specific rotatory power[] D20 -215o -225o Clarity 98.0% Ammonium salt[NH4] 0.02% Chloride[CL] 0.02% Residue on ignition 0.10% Sulfate[SO4] 0.02% Iron salt[Fe] 10 ppm Heavy metal[Pb] 10 ppm Arsenic salt 1 ppm Other amino acid Color layer can not be checked out. Loss on drying 0.20% Content 98.5 -101.0% Use:Used in biochemical research, nutrient; cure congenital cystinuria etc.. Storage:Stored in sealed container at room temperature.