... color solution, which leads to hydrogen or carbon monoxide at high temperature can be reduced to metallic copper. Mainly used for ... , enamel, paint industry, agent for take away, fungicides, solar heat absorber surface, reducing tobacco tar, artificial rainfall materials,etc. Testing ItemPlating ... ---Acid insoluble ≤%0.010.20.2Cl¯ ≤%0.010.20.2 High quality black copper oxide plating grade