Luminol at work - before spraying and after.

Credit: science.howstuffworks.com/luminol.htm
article: Chemiluminescent Luminol 		Other images from this article
Luminol footprint. Luminol at work - before spraying and after. Molecular structure of luminol Chemiluminescence of luminol
Luminol at work - before spraying and after., science.howstuffworks.com/luminol.htm