The breakdown or decomposition of colored substances, particularly the destruction of pigments or colored compounds in cells.
From Greek 'chroma' (color) + 'lysis' (loosening/breakdown). This scientific term from biology and chemistry describes the process of color degradation.
When you leave colored clothes in the sun for too long and they fade, that's chromolysis—the UV rays are literally breaking apart the molecules that make the color, which is why fading happens.
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