Lots More Information Related HowStuffWorks Articles How Light WorksHow Light Sticks WorkHow Blood WorksHow Fluorescent Lamps WorkHow DNA Evidence WorksHow do fireflies light up?How does a black light work? More Great Links Luminol: The Blood DetectorChemistry Comes Alive: LuminolThe Chemiluminescence of Luminol and bis (2,4,6-trichlorphenyl) oxalate (TCPO)Demonstration 23: Luminol - fractionating columnChemiluminescence - Glowing Tornados