Make: Easy 1+2+3 Projects

Sneaky UV Ink Password Protector

By Cy Tymony ■ Illustrations by Damien Scogin

You will need

Invisible ink (UV) marking pen

UV LED

Paper

Option 1:

Wide barrel pen

Coin cell battery

Tape

Option 2:

LED pocket light

Screwdriver

Option 3:

Spare remote control

With so many computer passwords to remember these days, it’s necessary to safely store them somewhere—but not in a computer file. So where?

Write them with an ultraviolet (UV) invisible ink pen so the information can’t be seen by the naked eye. Only shining a special UV light on the passwords will reveal them. Use paper with written material already on it, so people think the visible ...