Barium chromate
Description
A banana-color yellow pigment that is also called barium yellow. Barium chromate is precipitated from a barium chloride solution by the addition of potassium dichromate. Barium yellow is a fairly permanent pigment but it may turn green slowly in light. It has low tinting strength and opacity. It was not widely used as an artists pigment by itself but was sometimes mixed with strontium yellow and zinc yellow then sold under the name lemon yellow or citron yellow. It was also used for coloring glass and ceramic glazes. Currently barium chromate is used in anticorrosion pastes and in metal primers.
Synonyms and Related Terms
barium yellow; Pigment Yellow 31; CI 77103; Bariumchromat (Deut.); chromate de baryum (Fr.); cromato de bario (Esp.); amarillo de bario (Esp.); chromiko bario (Gr.); giallo di bario (giallo di barite) (It.); barium chromaat (Ned.); cromato de bário (Port.); amarelo de bário (Port.); ultramarine yellow; lemon yellow; lemon chrome; permanent yellow; baryta yellow; Steinbuhl yellow
Other Properties
Soluble in mineral acids. Insoluble in water or dilute acetic acid. Microscopically, it may appear as colorless, birefracting, rhombic plates,
| Composition | BaCrO4 |
|---|---|
| CAS | 10294-40-3 |
| Density | 4.45-4.49 |
| Molecular Weight | mol. wt. = 253.32 |
| Refractive Index | 1.94 - 1.98 |
Hazards and Safety
Human carcinogen. Skin contact may cause allergies. Acute ingestion may cause fatal chromium poisoning. Chronic inhalation may cause lung cancer and respiratory irritation. Combustible.
Barium and Chemicals: MSDS
Additional Information
° H. Kuhn, M.Curran, "Chrome Yellow and Other Chromate Pigments", Artists Pigments, Volume 1, R. Feller (ed.), Cambridge University Press: Cambridge, 1986.
Authority
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: Entry # 999
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966
- G.S.Brady, Materials Handbook, McGraw-Hill Book Co., New York, 1971
- Ralph Mayer, A Dictionary of Art Terms and Techniques, Harper and Row Publishers, New York, 1969 (also 1945 printing)
- 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
- Susan E. Schur, Conservation Terminology: A review of Past & Current Nomenclature of Materials, Technology and Conservation, Spring (p.34-39); Summer (p.35-38); Fall (p.25-36), 1985