Morning all, Hope everyone has enjoyed their break(?). Setting up a chromatography practical using colouring pens. I am using the chromatography paper, and have checked that I have cut it evenly and not allowed it to touch the side of the beaker, in addition to keeping the water line below the pencil line. I am finding that the water is rising up the paper unevenly which is making it hard to allow students to do their calculations of substance movement/solvent movements. Any ideas why this might be? Many thanks!