Surveillance via Residues on Paper

How do I surveille thee?* Let me count the ways...™

PhysOrg.com reports on a chemical process that can transform near lyundetectable residues of fingerprints and inkjet printer ink into visible evidence.

The detection limit is so low that details of a printed letter previously in an envelope could be read off the inside of the envelope...

Keep that in mind next time you casually recycle those envelopes and adjacent sheets of paper.

[via Schneier]

Related Posts:
Surveillance via Mobile Phones
Surveillance via Pizza Delivery
Surveillance via Abandoned DNA
Surveillance via Tire Pressure Monitoring Systems

* with apologies to Elizabeth Barrett Browning