... : Blue Green Crystal Cu 20%,21%,22%,23%, 24%,25% Factory,SGS,Intertek,BV. ISO9001:2008 GB/T 19001-2008 SPECIFICATION ... pesticides, fungicides, and for water treatment.Copper sulphate As a mordant for cotton and silk; Copper sulphate is used to produce green and blue ... A. We cooperate and invest large scale national factories of Copper Sulphate B. We have own warehouse and select good quality to ...