Nomenclature
CAS number: 13765-19-0
Calcium chrome yellow; gelbin; yellow ultramarine; C.I. 77223; C.I. Pigment Yellow 33.
CaCrO
4; mol wt 156.07.
Ca 25.68%, Cr 33.32%, O 41.01%.
Description and references
Prepn: Mylius, Wrochem, Ber. 33, 3689 (1900); Udy, US 2493789; US 2494215 (both 1950); Dunn, O'Brien, US 2745764/5 (both 1956 to Vanadium Corp. of
America).
Properties
Yellow monoclinic or rhombic crystals. Sparingly
sol in water; sol in dil acids; practically insol in alcohol. Also
occurs as hemihydrate, monohydrate, and dihydrate.Caution
Chromium hexavalent compounds are
listed as known human carcinogens: Report
on Carcinogens, Eleventh Edition (PB2005-104914, 2004)
p III-63.Use
As a pigment, corrosion inhibitor; manuf of chromium;
in oxidizing reactions; in battery depolarization.