Chromate

(kro'mat.) [See CHROMIUM.] (Chem.) A combination of chromic acid with abase. The most important are: C. of Lead, found native in translucent reddish-yellow crystals, known under the name of red lead ore. Artificially prepared it is a yellow, insoluble powder, which varies in shade according to the mode of preparation, and is much used as a pigment under the name of Chrome yellow. Form. P10.CrO3.-C. of pota ium. The neutral or yellow kind forms six-sided pyramids of a pale lemon-yellow color, soluble in twice its weight of cold water, and much more so in hot water. Form. KO.CrO3. The acid kind, as Bi-C. of Potash or Red C. of Potash, crystallizes in rich red prisms, and di olves in ten times its weight of cold water, and in le of hot. It is a powerful oxidizing agent, and is largely employed in dyeing and calico printing, and in the preparation of colored pigments. Form. KO.3Cr03. [s. 185]