The phenomenon or process of color change toward longer wavelengths, particularly in response to changes in chemical environment or depth.
From Greek 'bathos' (depth) plus 'chroma' (color) plus '-y' (process or condition). This term encompasses the overall concept of bathochromic shifting in chemistry and biology.
Bathochromy explains why some flowers change color as they age or why ocean creatures appear to change hue at different depths—their molecules aren't changing, just how light interacts with them!
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