Turn Your iPhone Into a Black Light


Turn on a black light in a dark room, and you’ll see a dim, purplish glow. But, the bulb also produces ultraviolet light, which you can’t see.

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As you know, — white T-shirts, fluorescent posters, toothpaste, and petroleum jelly, just to name a few. Why? Phosphors in these objects emit visible light in response to UV radiation from the black light. (Interestingly, the phosphors in white T-shirts come from the detergents we use to wash them.)

iPhone 6 black light

credit: Jeff Bertolucci

Here’s an oldie-but-goodie phone hack that’s fun for Halloween, takes only a few minutes, and probably won’t cost you a dime. We’re going to turn a smartphone’s camera flash into a black light!

OK, so maybe it’s not the world’s greatest black light — call it Black Light Lite — but it does work. Here’s how to do it.

Project supplies

credit: Jeff Bertolucci

Cut off a small piece of tape and cover the flash.

Apply the tape

credit: Jeff Bertolucci

Color the first layer of tape — just the part covering the flash –with blue Sharpie ink.

Blue Sharpie

credit: Jeff Bertolucci

Apply a second layer of tape. Use the purple Sharpie to draw over the blue-inked area.

Purple Sharpie

credit: Jeff Bertolucci

Turn out the lights (if it’s nighttime) or find a windowless room and shut the door. Turn on the phone’s flashlight and enjoy the eerie, bluish-purple glow.

Let the glowing begin! Here’s an example of neon-colored highlighter ink — a yellow Sharpie, in fact — glowing under my iPhone 6’s black light.

Neon-colored highlighter ink

credit: Jeff Bertolucci

White paper glows too, so I created a paper airplane for the occasion.

Paper airplane under black light

credit: Jeff Bertolucci

Halloween supplies are often black-light friendly.

Halloween supplies

credit: Jeff Bertolucci

The Skull of Doom glowed as well.

Toy skull under black light

credit: Jeff Bertolucci

What else glowed? A mouthful of toothpaste, but that photo (of me) was so disturbing that I chose not to upload it here.

Again, don’t expect the vibrant glow you’d get from a dedicated black light, but this simple hack is easy and fun, particularly with kids.

Crediits: Ehow.comVisit Original Source link