Lead chromate, basic
Description
An important commercial pigment called red chrome red. Basic lead chromate pigment that ranges in shades from orange to red. First made in 1809 by Vauquelin, basic lead chromate is formed by heating lead chromate and sodium hydroxide solution. The color of chrome red or chrome orange can vary from a brown-yellow to a brick-red color depending on particle size and to the ratio of lead oxide to lead chromate. It is stable in light but is not widely used because of its sensitivity to sulfur gases. Most often, chrome red is used as an anticorrosive base coats for steel.
Synonyms and Related Terms
basic lead chromate; Pigment Red 103; CI 77601; cromato bsico de plomo (Esp.); cromato bsico de chumbo (Port.); chrome red; chrome orange; lead chromate oxide; chromic acid lead; red lead chromate; Persian red; Austrian red; Derby red; Chinese red; Vienna red; Victoria red; American vermilion; garnet chrome; ruby red chrome; orange paste
Other Properties
Soluble in strong acids and alkalis. Insoluble in water.
| Composition | PbO-CrO3 |
|---|---|
| Molecular Weight | mol. wt. = 546.39 |
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
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
- The Merck Index, Martha Windholz (ed.), Merck Research Labs, Rahway NJ, 10th edition, 1983 Comment: entry 5423