A substance that displays different colors under different chemical conditions or when exposed to different wavelengths of light.
From Greek 'amphi' (both) + 'chroma' (color). This term is less common than its adjectival forms but refers to the actual substance capable of exhibiting multiple color states.
Amphichroms are the chemical basis of litmus paper and pH strips — they're literally color-changing materials that help scientists understand what's happening in solutions! Ancient dyers accidentally discovered some of these hundreds of years before we understood the chemistry.
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