Learners use filter paper and water to analyze six different markers. They mark the paper with ink, and dip the paper in water. The water travels up the paper and dissolved ink travels with it. The inks that are like water are carried quickly up the paper, while those inks that like paper are slowed down and separated. This process, known as chromatography, is frequently used by forensic scientists to separate and identify different substances. This activity is part of the Crime Scene Chemistry unit in OMSI's Chemistry Lab. Materials costs are for 100 uses.