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From: Webster's Revised Unabridged Dictionary (1913)

 Eu·chro·ic a.  Chem. Having a fine color.
 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.
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