Materials: 1 glass, pencil, paper towel or coffee filter, black Crayola marker (or any color on hand — not permanent), tape. ... How it works: This activity is done using paper chromatography.

This same process can be put to good use as a technique called paper chromatography. ... Preparation • Cut the paper towels into strips that are each about one inch wide.

Materials • Paper towels (Thicker ones will work better.) ... In paper chromatography the pigments move up the paper with the liquid and are separated based on the solubility of the pigments.