He colors sticky tapes in blue, and transforms his phone into an X-ray ...

We call them smartphones, and it's true they are smart! Did you know that you could turn your phone into an ultraviolet device?

If you want to see how much dirt and unsuspected bacteria exist in your home, especially in your bathroom, here's a test it:

What you need :

• transparent scotch tape
• 1 blue sharpie
• 1 purple sharpie

What you do :

• Glue a first piece of tape to the flash of your phone.
• Color it in blue.
• Add a second piece of scotch tape over it and color it in blue too.
• Add a 3rd piece of tape and color it in purple.

You have your ultraviolet light! Go into the bathroom, turn off the lights, turn on your phone camera, turn on the flash, and then take a picture of the toilet. You'll probably see this:

There are fluids, dirt and bacteria on your toilet seat ... Disgusting, right ?!