What's Happening in Paper Chromatography? Try mixing one half water and one half alcohol as your solvent and see how the colours separate.If the pen line remains unchanged in water, try with the same pen type on another strip of paper towel but substitute the alcohol or nail polish remover.If using alcohol or nail polish remover as all or part of your solvent, place a cap of aluminum foil over the glass to keep the vapours in the glass.The strip should not touch the bottom of the cup.There should be enough water in the cup so that the paper towel strip touches the water but the pen line is NOT submerged.Tape the paper towel strip from the end opposite to the pen line onto the middle of the straw so the strip will hang when the straw is placed crosswise onto the cup.Draw a line across 6 paper towel strips or coffee filter strips about 1 inch from the bottom.water soluble pens or markers of different brands or colours.Chromatography can be demonstrated using a simple demonstration.
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