Crime Lab Chemistry
1985. GEMS. Challenged to determine which of several black pens was used to write a ransom note, students learn and use paper chromatography, as they explore the concepts of solubility, pigments, and separation of mixtures. Several mystery scenarios are suggested, with intriguing characters. In a special "Going Further" activity, students use "candy chromatography" to solve an additional mystery. 104 pages, soft cover, b&w illustrations. Grade 4-8.