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The staining of a TLC plate with iodine vapor is among the oldest methods for the visualization of

organic compounds. It is based upon the observation that iodine has a high affinity for both

unsaturated and aromatic compounds.

Preparation: A chamber may be assembled as follows: To 100 mL wide mouth jar (with cap) is added

a piece of filter paper and few crystals of iodine. Iodine has a high vapor pressure for a solid and the

chamber will rapidly become saturated with iodine vapor. Insert your TLC plate and allow it to remain

within the chamber until it develops a light brown color over the entire plate. Commonly, if your

compound has an affinity for iodine, it will appear as a dark brown spot on a lighter brown background.

Carefully remove the TLC plate at this point and gently circle the spots with a dull pencil. The iodine

will not remain on the TLC plate for long periods of time so circling these spots is necessary if one

wishes to refer to these TLC's at a later date.

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Q: Why iodine is used in thin layer chromatography?
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