Magenta crystal with a density of 1.705 and melting point at 140â?? , soluble in water, acid and ethanol. Used as catalysts, drying agent and printing and drying agent, medicine intermediate and analytical reagent. Store in a cool, ventilated, dry warehouse. Sealed package be kept away from deliquescence, damp, heat and direct exposure to the sunlight. Separated stored and transported from food chemicals.