Learners mix a solution containing luminol and copper with a fake blood solution. A chemical reaction between the luminol solution and fake blood (hydrogen peroxide) show learners a blue glow. Forensic scientists spray luminol onto surfaces at crime scenes to detect invisible blood stains. Luminol solution reacts with blood, changing the structure of the molecule and temporarily adding energy. This energy causes the luminol to glow. This activity is used in the Crime Science Chemistry unit in OMSI's Chemistry Lab. Supply estimates are for 100 learners. For safety reasons, this activity should be conducted as a demonstration for younger audiences.