Blacklights are pretty cool — which is why you’ll often find them at nightclubs or late-night after-parties. Then again, there’s also the use we’ve all seen on TV — the glowing fixtures reveal a great deal of nasty stains that the naked eye can’t actually see.
But you don’t have to be a club owner or a CSI detective to own your own blacklight. With just your phone, two Sharpies, and some clear tape, you too can solve crimes (okay, not really) or bust a move in the comfort of your own home.
I’m not sure I want to know what lurks on my toilet seat…but I will use this for my next house party. What a cool trick!