Euchroic

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CIDE DICTIONARY

Euchroic, a. [Gr. well-colored; e'y^ well + color.].

Having a fine color. [1913 Webster]

Euchroic acid (Chem.), an organic, imide acid, obtained as a colorless crystalline substance, C12H4N2O8 by heating an ammonium salt of mellitic acid. By reduction it is changed to a dark blue substance (euchrone), -- hence its name.