... 99%, Production following the state standards used in producing glass,ceramic,fire works, etc.... Classification: Copper OxideCAS No ... Origin: Tianjin China (Mainland)Grade Standard: Agriculture Grade, Industrial G...Purity: 89%,98%, 99%Appearance: black powderApplication: ... %, Production following the state standards used in producing glass,ceramic,fire works, etc.Copper OxideItem Standard I ...