The phenomenon of color change in substances due to depth, pressure, or change in solvent, often observed in dyes and marine life.
From Greek 'bathos' (depth) plus 'chroma' (color) plus '-ism' (condition). This term originated in chemistry and marine biology to describe color transformations at different depths.
Bathochromatism is why bioluminescent fish can appear different colors at different depths—the water itself filters and changes what colors we perceive, creating a visual illusion of color shifting!
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