... )Competitive prices (4)Timely delivery I. We are manufacturer of copper sulfate,cupric sulfate,bluestone,Copper sulfate pentahydrate,CuSO4, blue vitriol,cuprum sulfuricum copper ... ,CuSO4, blue vitriol,cuprum sulfuricum copper sulfate pentahydrate usage:It is mainly used in productions of copper salts,dyestuffs,mordant,pigment,preservative ...