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A number of chromatography experiments using cellulose thin layers and aqueous eluents are proposed to illustrate:
1. How chromatography can be used for "pattern recognition" of the inks of felt-tip pens.
2. The principle of displacement chromatography of the constituents of the antiseptic Mercurochrome.
3. Salting-out chromatography for the separation of halides using a nearly saturated ammonium sulfate solution as eluent.
4. The impossibility to use chromatography alone as a method of identification: Methyl Orange travels differently in presence and absence of cyclodextrins or starches in the sample to be analysed.
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