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u have to see the ink that comes and see which 2 colours are same and next to each itherr

That is for paper chromatography!

In gas chromatography you determine the concentration of the compound of interest in the sample by determining the area under the peak (AUC). The bigger the peak the higher the concentration. You compare this value to the standard curve that should be run at the same time, to determine the quantitative concentration value. The order of the peaks in the chromatograph tells you which compounds exited first and which where "retained" longer. Retention time is specific for a given compound under the conditions of the GC and can be used to identify your compound of interest.

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