Copper chloride

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Anhydrous copper chloride has dark yellow crystals that absorb water to form green deliquescent crystals. Copper chloride is used as a Disinfectant, Fungicide, and Wood preservative. It is also used as a fixer in photography, a Mordant in dyeing textiles and a component in indelible inks. In metallurgy, copper chloride is used refine Gold and Silver, to recover Mercury from ore, and to electroplate Copper on Aluminum. Copper chloride is also used as a Glass and ceramics pigment.

Synonyms and Related Terms

cupric chloride; copper (II) chloride


Copper chlorides, mostly atacamite.TIF

Chemical structure

Copper chloride.jpg


  • Toxic by ingestion and inhalation.
  • Skin contact causes irritation.
  • ThermoFisher: SDS

Physical and Chemical Properties

Soluble in alcohols, water and acetone. Aqueous solution is acidic.

Composition CuCl2
CAS 7447-39-4
Density 2.54 g/ml
Molecular Weight mol. wt. = 134.45
Refractive Index 1.644, 1.684, 1.742

Resources and Citations

  • Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2699
  • CRC Handbook of Chemistry and Physics, Robert Weast (ed.), CRC Press, Boca Raton, Florida, v. 61, 1980 Comment: ref. index=1.644, 1.684, 1.742