Copper sulfate (blue vitriol; bluestone; chalcanthite). It can be used as mordant in the dyeing and printing of cotton and silk, or used in green/blue pigments; moreover, it can be used as insecticide, bactericide of water, antiseptic of wood, or used in tannage, plating of copper, battery, curving and catalyst. In addition, it also can be used in ore dressing, coat paint and other chemical materials