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Column chromatography for beginners. First, look after an immobile phase (usually silica or alumina) what was tested before with the correct eluent (mixture of 2 or more organic solvent). If the mixture of compounds separate with this mixture on a TLC (thin layer chromatography) what is made from the same immobile phase it will hopefully work on a larger scale also.
A fun chromatography lab with filter paper as the solid phase and isopropyl alcohol/water as the mobile phase. We tested 2 brands of water-soluble markers and 2 brands of permanent markers. The students got an appreciation that "green" isn't just "green".