Black lights use UV (ultraviolet) light, and can be used to create some of the coolest special effects you've ever seen. Almost anything white will glow when you hit them with light from black lights. Black lights are perfect for any party, dorm room or club. There's no limit to the fun you can have under black light! Black lights have hundreds of uses. In addition to just plain having fun with them, they can be used for checking hand stamps, finding pet stains (such as cat urine), checking for bacteria, applying black light sensitive cosmetics, searching for antique glass. This powerful ultraviolet light exposes paint, glue, and other repairs hidden to the naked eye.