Used as a pigment, desulfurizer, catalyst for glass and porcelain, and also used in the rayon industry It is used as a colorant in the glass, enamel, and ceramic industries, an anti-Zou agent for paint, and a polishing agent for optical glass. For the manufacture of dyes, organic catalyst supports and copper compounds. It is also used in the rayon manufacturing industry and as a desulfurizer for oils and fats. It is used as a raw material for other copper salts, and it is also a raw material for artificial gemstones.