Lead chromate
Description
An important commercial yellow pigment called Chrome yellow. Lead chromate can range in shade from lemon yellow to orange depending on its particle size and hydration state. Chrome yellow, which came on the market in early 1800s, is fairly permanent to light, but has been known to darken on aging or with exposure to Hydrogen sulfide. Chrome yellow is used in industrial paint, some artists paint and ceramic glazes.
Synonyms and Related Terms
chrome yellow; Pigment Yellow 34; CI 77600; chromate de plomb (Fr.); cromato de plomo (Esp.); Chromgelb (Deut.); chromikos molybdos (Gr.); kitrino toy chromioy (Gr.); gialli di cromo (It.); loodchromaat (Ned.); cromato de chumbo (Port.); lead chrome yellow; chrome red; chrome orange; Paris yellow; king's yellow; Cologne yellow; Leipzig yellow
Other Properties
Soluble in strong acids and alkalis. Insoluble in water.
| Composition | PbCrO4 |
|---|---|
| CAS | 7758-97-6 |
| Melting Point | 844 |
| Density | 5.96-6.3 |
| Molecular Weight | mol. wt. = 323.19 |
| Refractive Index | 2.31; 2.49 |
Hazards and Safety
Human carcinogen, teratogen and suspected mutagen. Skin contact may cause allergies. Ingestion may cause fatal chromium/lead poisoning. Chronic inhalation may cause lung cancer and respiratory irritation.
LINK: International Chemical Safety Card
Additional Information
H. Kuhn, M.Curran, "Chrome Yellow and Other Chromate Pigments", Artists Pigments, Volume 1, R. Feller (ed.), Cambridge University Press: Cambridge, 1986.
Additional Images
Chromium yellow
Sources Checked for Data in Record
- R. J. Gettens, G.L. Stout, Painting Materials, A Short Encyclopaedia, Dover Publications, New York, 1966 Comment: density 5.96 and ref. index 2.31; 2.49
- 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 Comment: entry 5422
- The Dictionary of Art, Grove's Dictionaries Inc., New York, 1996 Comment: "Pigments"
- Richard S. Lewis, Hawley's Condensed Chemical Dictionary, Van Nostrand Reinhold, New York, 10th ed., 1993
- Van Nostrand's Scientific Encyclopedia, Douglas M. Considine (ed.), Van Nostrand Reinhold, New York, 1976
- Art and Architecture Thesaurus Online, http://www.getty.edu/research/tools/vocabulary/aat/, J. Paul Getty Trust, Los Angeles, 2000