Black lights (formally, Ultraviolet or UV lights) are just fun. Not only are they great for when you are in a trance, but they can be used to identify those questionably unidentifiable stains on your bf's or gf's clothes. But the coolest thing is how certain colors or chromophores react with UV lights. Whites and fluorophore compounds (chemical side chains responsible for fluorescence) are especially colorful under a good UV lamp or array of UV LEDs.
In this instructable, I'll show you how to create your own fluorescent compounds out of something you probably already have in your home.
What's the first thing that comes to mind when thinking about fluorescent ... well, besides fluorescent lighting? Fluorescent markers, that's what! Otherwise going by "Hi Liters" or some such thing, these humble little buggers are just screaming to be used for something besides highlighting organic chemistry text books. And we're going to listen to their plea.
Grab some highlighters from your desk, bureau, backpack, friend's locker, mom's credenza...you know, wherever. They're lying all about if you really look for them, those unassuming little pearls hiding right in front of our piggish noses. You can use the big fat ones or the slimmer bic-type highlighters, depending on how much fluorescent solution you want to make. The slim versions are fine to make about 150mL to 200mL, depending on how much highlighter fluid is in the highlighter pen. The fat highlighters can make upwards of 500mL of fluorescent solution.