Capable of producing, developing, or exhibiting color; describing substances, organisms, or reactions that generate chromatic effects.
From 'chromogen' plus the suffix '-ic' (of or relating to), becoming the standard modern adjective form in chemistry and biology for color-producing properties.
Chromogenic bacteria are why old photographs slowly turn color (they produce pigments), and chromogenic tests in medical labs change color to show the presence of disease—it's chemistry working as a visual signal.
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