Colorless crystals or white powder. [Molecular Weigh] 150.09 [CAS Number] 133-37-9 [Apperance] Colorless crystals or white powder,[Character] Without odor, with sour taste, stable in air, compound of equal quantity of dextrorotatory and levorotatory tartaric acid, containing one or two molecule crystalline water and losting water when heated to 100°C, specific gravity 1.697. Its solubility in ...