Iron chromate
Description
A yellow powder occasionally used as a pigment called siderin yellow. Iron chromate is precipitated from a solution of a chromate salt, such as Potassium dichromate by the addition of Ferric chloride. The pure pigment is bright yellow, but some residual impurities, such as iron oxide, may result in a dull orange pigment color. Siderin yellow is compatible with all paint binders. Iron chromate produces a gray ceramic glaze when used in concentrations of 0.5-2.0%, while it produces a brown glaze color when mixed with zinc. It has also been used as as a colorant in glass and enamel.
Synonyms and Related Terms
siderin yellow; Pigment Yellow 45; CI 77505; chromate de fer (Fr.); cromato de ferro (Port.); chromate of iron; ferric chromate
Risks
- Human carcinogen.
- Skin contact may cause allergies. Acute ingestion may cause fatal chromium poisoning.
- Chronic inhalation may cause lung cancer and respiratory irritation.
- ThermoFisher: SDS
Physical and Chemical Properties
Soluble in acids. Insoluble in water, and ethanol.
| Composition | Fe2(CrO4)3 |
|---|---|
| CAS | 10294-52-7 |
| Molecular Weight | mol. wt. = 459.73 |
Resources and Citations
- H. Kuhn, M.Curran, "Chrome Yellow and Other Chromate Pigments", Artists Pigments, Volume 1, R. Feller (ed.), Cambridge University Press: Cambridge, 1986.
- Robert Fournier, Illustrated Dictionary of Practical Pottery Chilton Book Company, Radnor, PA, 1992.
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Michael McCann, Artist Beware, Watson-Guptill Publications, New York City, 1979
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983