Smartphone Hack: How to Make Any Phone a Black Light Instantly

All you need to get an instant black light on your phone? No, it’s not a fancy upgrade or new app—and you probably have these simple materials at your fingertips already!

Armed with a purple and blue Sharpie and some cellophane tape, you can easily transform any normal phone flashlight into a useful black light.

Black lights are useful in helping illuminate things our naked eye cannot spot. They’re used to create mind-blowing special effects, but also have more practical real-world applications—for example they are used by crime scene investigators in detecting tiny hidden scraps of evidence.

Black lights, otherwise known as ultraviolet light, are also useful if you plan on sending super-secret messages.

Check out the slideshow above for the super easy, super quick tutorial.