3 years ago

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

1 answer:

8 0

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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