Self Destructing Spy Paper
If you have seen the movie Mission Impossible then you will have seen the self destructing tape which plays what it needs to play and then goes up in a pile of smoke. The self destructing spy paper is a unique idea which doesnt go up in a puff of smoke unfortunately, but does completely dissolve when it gets wet which completely rids the paper of what is written on it. It looks like regular paper but dissolves in just seconds when any liquid is applied. I guess that gets rid of the need of a paper shredder.
Prices and availability can be found over at PIMall.
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Sounds a little like the paper in The Da Vinci Code, which dissolves when exposed to water.