Chem. [f. CHROMIUM or CHROM-IC + -ATE4.] A salt of chromic acid; e.g., chromate of lead, Pb Cr O4, much used as a yellow pigment.
The chromates containing one equivalent of the acid, are called neutral, normal, mono-, or meta-chromates. Chromates with two equivalents of the acid are called acid, bi-, or di-chromates; there are also hyperacid chromates or tri-chromates.
1819. Children, Ess. Chem. Anal., 200. The chromate, the only one of these salts that is coloured, is yellow.
1840. Henry, Elem. Chem., II. 121. Chromate of lead is found native in fine orange-coloured prisms.
1871. Tyndall, Fragm. Sc. (ed. 6), I. iv. 103. A solution of the yellow chromate of potash.
1872. Watts, Dict. Chem., I. 938. Hyperacid chromate or Trichromate of Potassium.
