... , tasteless, nontoxic, fine particle. It is amphoteric oxide, soluble in acid, NaOH, NH4CL, not soluble in water, ethanol, ammonia. It can ... .0003 Copper oxide(alculated with Cu),% ≤0.00020.00040.0007 Hydrochloric acid insoluble matter ,% ≤0.0060.0080.05 Burnt loss,% ≤0.20 ... should be kept from breakage, moisture, pollution, and touch with acid. The period of validity is half a year, after expiry ...