... Copper Oxide Purity:99%, Production following the state standards used in producing glass,ceramic,fire works, etc.... Classification ... of Origin: Tianjin China (Mainland)Grade Standard: Agriculture Grade, Industrial G...Purity: 89%,98%, 99%Appearance: black powderApplication: indrustrail ... Oxide Purity:99%, Production following the state standards used in producing glass,ceramic,fire works, etc.Copper ...