The Collaborative International Dictionary
Amphichroic
Amphichroic \Am`phi*chro"ic\, a. [Gr. 'amfi` + ? color.] (Chem.) Exhibiting or producing two colors, as substances which in the color test may change red litmus to blue and blue litmus to red.
Wiktionary
amphichroic
a. (context chemistry English) Exhibiting or producing two colours, as substances which may change red litmus to blue and blue litmus to red.