A type of chemical isomerism where compounds have the same molecular formula but differ in color due to different arrangements of atoms or bonds.
From Greek 'chroma' (color) + 'iso' (equal) + 'meros' (part) + '-ism' (condition). This scientific term emerged in the 19th century chemistry literature to describe color variations in compounds with identical composition.
Some chemicals can look completely different colors even though they're made of exactly the same atoms—it's all about how those atoms are arranged, kind of like how the same LEGO bricks can make totally different-looking structures depending on how you snap them together.
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