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In paper chromatograhy,why do people always have to cover the container(either with a lid or cover)?

The container contains: Chromatography paper, solvent and dyes (on the chromatography paper itself)?
Abdul Azeez:

To prevent evaporation.
Chromatographic separation relies upon the solvent climbing the paper. If the solvent evaporates while climbing the paper, the separation will be worse.
For separations that take a long time, and for solvents that are volitile, the effect will be worse.


Mainly to prevent dust in the air from settling on the paper. That will effect the quality of the picture taken.

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