Chemists can use many different methods to analyse substances. Some methods rely on chemical analysis, while others rely on machines.
Paper chromatography
Paper chromatography is used to analyse coloured substances, such as the coloured pigments in plants and artificial colours used as food additives.
Paper chromatography works because some of the coloured substances are better at dissolving in the liquid than they are at bonding with the paper, so they travel further up the paper.
Two substances are likely to be the same if they have the same colour and they travel the same distance up the paper.
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