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.

FTIR (MFA) (Forbes 498)

Cobalt Violet, dark (498).PNG

Raman (MFA) (532nm)

Cobalt violet (Forbes MFA 498), 50X, 532 nm.TIF

Raman (MFA) (785nm)

Cobalt violet dark (Forbes MFA 498), 785nm resize.tif





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


  • 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.
  • NIH: Information shet

Physical and Chemical Properties

Soluble in mineral acids. Insoluble in water.

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

Resources and Citations

  • 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