Relating to or characterized by two colors; having or using two colors in composition or appearance.
From 'bi-' meaning two, combined with 'chromic' (from Greek 'chroma' meaning color). This adjectival form parallels 'bichromatic' and developed alongside the growth of color science and printing.
Materials scientists discovered that some compounds are bichromic in different solvents—the same chemical can be one color in water and a completely different color in alcohol, a phenomenon that's still useful for creating color-change sensors!
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