... ,we can supply high purity,low heavy metal copper sulphate ,appearance: blue crystal. COPPER SULPHATE PENTAHYDRATE CRYSTAL Specification:ITEMSUNITSPECIFICATIONCu(%)min25Pb(ppm)max20As ... it is used in wood antisepsis, mill run, tan, dyestuff, catalyst and so on.StorageSealed in cool dry placeQualities are conformed ...