Luminol in the Classroom

Thanks to a good friend, I was able to get my hands on some luminol solution-- the stuff used in crime scenes to detect blood. I considered showing my students the demonstration on Halloween, but later decided to do it as part of my chemical & physical change unit (mainly because I will have my first formal observation). Apparently, the reaction is perfect, in the sense that it creates light and no heat energy. The only thing missing from this procedure is that you need to add to the peroxide a 10:1 water:bleach solution.