Copper(II) chloride dihydrate is used as catalyst for organic and inorganic reactions. In petroleum industry it is used as deodorizing, desulphurising and purifying agent. Used as mordant for dyeing and printing textiles, and as oxidizing agent for aniline dye stuffs. It is also used in indelible, invisible and laundry marking inks and for electroplating copper on aluminium. It is also used as pigments for glass, ceramics and as component of wood preservative, disinfectant and animal feed supplement.