The property or quality of displaying two or more colors, or the ability to change colors in response to different conditions.
From Greek 'amphi' (both) + 'chroma' (color) + '-y' (noun-forming suffix). This term refers to the phenomenon or capability itself, rather than specific substances exhibiting it.
Amphichromy in nature serves serious biological purposes — it helps animals communicate, camouflage, regulate temperature, and attract mates! What looks like simple color-changing is actually a complex evolutionary strategy.
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