Cobaltous ammonium sulfate

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Ruby red crystals. Cobaltous ammonium sulfate is used as a colorant in glass, glazes, enamels and for cobalt plating.

Synonyms and Related Terms

cobaltous ammonium sulphate (Br.); sulfato de amonio cobalto (Esp.); solfato di ammonio e cobalto (It.)


  • Skin contact may cause allergies, especially on elbows, neck and ankles.
  • Chronic inhalation may cause asthma.
  • Ingestion may cause vomiting, diarrhea and the sensation of hotness.

Physical and Chemical Properties

Soluble in most acids. Insoluble in water.

Composition CoSO4-(NH4)SO4-6H2O
Density 1.902 g/ml

Resources and Citations

  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993

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