Cuprous cyanide

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Toxic white powder or colorless (or green or red) crystals. Cuprous cyanide has been used as an Insecticide, Fungicide, and antifouling agent in marine paints. It has also been used to form synthetic patinas on Copper and Bronze objects.

Synonyms and Related Terms

copper (I) cyanide; cupricin


  • Toxic by ingestion, inhalation and skin absorption.
  • Contact causes irritation.
  • Fisher Scientific: MSDS

Physical and Chemical Properties

  • Soluble in ammonia. Almost insoluble in water, alcohol, cold dilute acids.
  • Decomposed by concentrated nitric acid
Composition CuCN
CAS 544-92-3
Melting Point 474 C
Density 2.92 g/ml
Molecular Weight mol. wt. = 89.56

Resources and Citations

  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2731