A mixture of four coloured dyes is analysed by chromatography.
The result is shown.
Which change allows the four coloured dyes to be seen separately?
1 )
Measure the R$_{\text{f}}$ values of the spots carefully.
2 )
Run the chromatogram for a longer time.
Run the chromatogram using a different solvent.
4 )
Use a locating agent.
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