rare. [a. F. colorant, pr. pple. of colorer, ad. L. colōrāre to color: see -ANT1.] A coloring matter, pigment.
1884. Cochin, in Pop. Sci. Monthly, XXV. 207. This wonderful colorant [rosaniline] may be constituted by the action of almost any of the oxidizing agents … upon aniline.
