A type of isomer or structural variation in a molecule where atoms are arranged differently, resulting in different color properties.
From Greek 'chroma' (color) and 'isomer' (equal parts). This chemistry term describes compounds with identical molecular formulas but different structural arrangements that affect color.
Some molecules are color chameleons—the same atoms arranged slightly differently can turn a compound from colorless to bright red! This is why chemists sometimes discover that a completely new color is hiding in a molecule they thought they understood.
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