Copper sulphate, also known as bluestone, is a chemical compound comprised of Copper, Sulphur and Oxygen whose formula is CuSO4.  Copper Sulphate is an odourless crystalline substance, electric blue in colour and highly toxic.

Industrial, professional, consumer uses; Absorbents; Ceramics; Coatings and inks; Cosmetics; Electroplating and galvanic; Fertiliser; Glass; Laboratory chemicals; Lubricants and greases; Leather dyes; Mineral flotation; Raw material for non-ferrous smelting; Non-metal surface treatment; Pigments; Processing aids; Putties, fillers, construction chemicals; Polishes and waxes; Photo chemicals; Raw material for production of other compounds and fine chemicals; Rubber and plastic; Washing and cleaning products; Catalyst; Textile dyes; Adhesives; Water treatment.

Copper sulphate is also used to control algae growth in lakes, ponds or swimming pools. Dissolve small concentrations of copper sulphate in water for inhibiting algae growth.