A laboratory technique where two or more substances are separated and analyzed simultaneously using chromatography, allowing direct comparison of their properties.
From prefix 'co-' (together) + 'chromatography' (color-writing/separation technique), indicating simultaneous analysis of multiple compounds.
Cochromatography revolutionized analytical chemistry by letting scientists run samples side-by-side, which made it obvious when compounds were identical—they'd run at exactly the same rate on the same filter paper.
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