Appearance: Blue Green Crystal Cu 20%,21%,22%,23%, 24%,25% Factory,SGS,Intertek,BV. ISO9001:2008 GB/T 19001-2008 SPECIFICATION Cu23.0 %MINSO437.5 %MININSOLUBLE IN H2O 1.5 %MAXFREE MOISTURE 3.0 %MAXFe1.0 %MAXZn500ppm MAXAs10ppm MAXCd10ppm MAXCr10ppm MAXPH VALUE 5%SOL N3-4ApplicationCopper Sulphate is used for extracting the other copper is also used as a textile mordant, agricultural pesticides, ...