Copper chloride dihydrate is used as an additive of copper ion in electroplating bath in electroplating industry. Used as colorant for glass and ceramics and catalyst for hydrogenation of organic compounds. Deodorizer, desulfurizer and purifier for petroleum industry. Mordants and dye colorants for printing and dyeing. Used for metal smelting, photographic plate making, as corrosive agent and wood anti-corrosion. It is used as an additive for insecticide, water purification disinfectant and fish feed.