Cobalt violet, deep
Description
A medium to strong violet pigment composed of Cobaltous phosphate. Deep cobalt violet was first developed in 1859 by Salvetat and sold as an artists' pigment in 1890. The colorfast pigment has low tinting strength and dries quickly in oil paints.
Synonyms and Related Terms
cobalt phosphate; deep cobalt violet; Pigment Violet 14; CI 77360; violeta de cobalto intenso (Esp.); violet de cobalt (foncé) (Fr.); Kobaltviolett (dunkel) (Deut.); iodes toy kobaltioy skoyro (Gr.); violetto di cobalto scuro (It.); cobalt violet (donker) (Ned.); violeta de cobalto, escuro (Port.)
Other Properties
Microscopically, the particles are strongly pleochroic with colors from pink to violet to yellow. Highly birefringent under crossed polars. Appears magenta with Chelsea filter.
| Composition | Co3(PO4)2 - 8H2O |
|---|---|
| Refractive Index | >1.662 |
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.
Additional Information
° Pigments Through the Ages: Cobalt violet
° Corbeil, Marie-Claude, Jean-Pierre Charland, Elizabeth Moffatt. 'The characterization of cobalt violet pigments' Studies in Conservation vol.47 (2002), pp.237-249.
Authority
- Nicholas Eastaugh, Valentine Walsh, Tracey Chaplin, Ruth Siddall, Pigment Compendium, Elsevier Butterworth-Heinemann, Oxford, 2004
- Reed Kay, The Painter's Guide To Studio Methods and Materials, Prentice-Hall, Inc., Englewood Cliffs, NJ, 1983
- Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
- Random House, Webster's Encyclopedic Unabridged Dictionary of the English Language, Grammercy Book, New York, 1997
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000
- Thomas B. Brill, Light Its Interaction with Art and Antiquities, Plenum Press, New York City, 1980