... supply high purity,low heavy metal copper sulphate ,appearance: blue crystal. COPPER SULPHATE PENTAHYDRATE CRYSTAL Specification:ITEMSUNITSPECIFICATIONCu(%)min25Pb(ppm)max20As ... PackingNet weight 25kgs woven bags with inner linerUsesCuSO4·5H2O is used as supplement of Cu in feed field ; ... as pesticide in agriculture, and in industry it is used in wood antisepsis, mill run, tan, dyestuff, ...