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16 June, 10:30

Why should you never use a pen, but rather a pencil, to mark your starting line on a tlc plate?

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  1. 16 June, 12:30
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    You can't use a pen because the ink will travel up the TLC plate with the TLC solvent, just like your chemical samples do.

    You can only spot/label/mark TLC plates using a pencil. The graphite in a pencil will not run up the plate!
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