When its’s not enough to simply shred your confidential documents, you can now turn to Spy Paper. It works like normal paper except that contact with any liquid will cause it to immediately dissolve into a useless, non- reconstructible mulch. A pad of 32 sheets measuring 7centimeters by 10.75 centimeters (2.75-inches by 4.25-inches) costs $4.95 USD. The pad also comes with a sealable storage bag. Other sizes are also available.
You no longer have to chew up and swallow those confidential notes – Just spit and watch them disappear!
Source: Ubergizmo