News

The Spy Secrets Of The Last Unsealed WWI Files

The oldest secret documents in the CIA’s treasure-trove have been cracked open finally. Believed to be the only remaining classified WWI documents, the six files have revealed all manner of espionage tricks – including the recipe for German invisible ink.


April 4, 2011
Gadgets

DIY: Retrofit An Inkjet Printer With Invisible Ink

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 espionage machine. Enjoy! [MAKE]


September 22, 2010
Geek Out

British Intelligence Agency Used Semen As Invisible Ink

A new book reveals that a member of MI6, the British spy agency, discovered during WWI that semen makes excellent invisible ink and often deployed it in the field. The name of the man who discovered this? Mansfield Cumming.