Cobaltous phosphate

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Cobalt violet dark


A medium to strong violet pigment with a reddish hue. Cobaltous phosphate, or deep cobalt violet, was first prepared in 1859. It is a permanent pigment but it has low tinting strength. It dries quickly in oil paints. Cobaltous phosphate is also used as a colorant in Glass, glazes, enamels, and plastics.

Synonyms and Related Terms

cobalt phosphate; Pigment Violet 14; CI 77360; fosfato de cobalto (Esp., Port.); violeta de cobalto (Esp.); phosphate de cobalt (Fr.); fosfato di cobalto (It.); cobalt violet, deep

Other Properties

Soluble in mineral acids. Insoluble in water.

Composition Co3(PO4)2 - 8H2O
CAS 13455-36-2
Density 2.769
Molecular Weight mol. wt. = 366.74

Hazards and Safety

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.


  • Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
  • Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
  • The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 2508
  • Thomas B. Brill, Light Its Interaction with Art and Antiquities, Plenum Press, New York City, 1980

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