While I doubt the super serious stiff in this DIY video is actually a super spy, he does have the DIY know-how necessary to hack apart an inkjet printer and make it into an invisible ink-spitting ...

Researchers have developed a rewriteable paper coating that can encrypt secret information with relatively low-tech invisible ink -- water. A message printed out by a water-jet printer on a ...

Here’s a fun way for junior spies to write covert messages to friends and family. This DIY invisible ink lesson is adapted from The James Dyson Foundation science ...