Any of a course of blue or green dyes created by oxidation of phenols and aromatic diamines
anyone of a series of synthetic blue dyestuffs, resembling indigo in appearance, and acquired because of the activity of phenol on certain nitrogenous derivatives of quinone. Simple indophenol proper, the parent compound for the dye series, is a quinonimine derivative using formula C12H9NO2.
A coal-tar color used in dyeing, generated by the multiple oxidation of a phenol and a paradiamine. It comes down into business as a blue powder resembling indigo. It creates on cotton fiber and wool indigo-blue tones, quickly to light and bleaching-powder, but damaged by even poor acids.