Relating to a shift in light absorption toward longer wavelengths (red end of spectrum) caused by a chemical change or depth.
From Greek 'bathos' (depth) plus 'chroma' (color) plus '-ic' (relating to). This term became standard in chemistry and physics to describe spectral shifts.
When a dye goes bathochromic, it's like it 'blushes' toward red—adding certain chemicals literally shifts what color wavelengths the molecule absorbs, which is why printing companies can match any color imaginable!
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