A visual record or pattern produced by chromatography showing the separated components of a mixture as distinct spots, lines, or bands.
From Greek 'chroma' (color) + 'gramma' (written record). The term emerged in the early 20th century when scientists first visualized separated chemical compounds and noticed they appeared as colored marks on paper.
Chromatograms are like chemical fingerprints—each substance leaves its own unique pattern when separated, which is why forensic scientists use them to identify drugs, dyes, and toxins in crime scenes.
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