UK fingerprint 'developer' can read a letter from its envelope

Nov 10, 2008
UK fingerprint 'developer' can read a letter from its envelope

(PhysOrg.com) -- UK scientists have discovered a fingerprint'“developer' which can highlight invisible prints on almost any surface – and read the text of a letter just from the envelope it was sent in.

Paul Kelly and colleagues at Loughborough University found that a disulfur dinitride (S2N2) polymer turned exposed fingerprints brown, as the polymer reaction was initiated from the near-undetectable remaining residues.

Traces of inkjet printer ink can also initiate the polymer. 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 after being exposed to S2N2.

“A one-covers-all versatile system like this has obvious potential,” says Kelly.

“This work has demonstrated that it is possible to obtain fingerprints from surfaces that hitherto have been considered extremely difficult, if not impossible, to obtain,” says Colin Lewis, scientific advisor at the UK Ministry of Defence. “The method proposed has shown that this system could well provide capabilities which could significantly enhance the tools available to forensic scientists in the future.”

Original article: Paul F. Kelly, Chem. Commun., 2008, DOI: 10.1039/b815742a

Provided by Royal Society of Chemistry

Explore further: Na-ion batteries get closer to replacing Li-ion batteries

add to favorites email to friend print save as pdf

Related Stories

Recommended for you

What causes the sunlight flavour in milk?

19 hours ago

Most of us have tasted milk that has been left in the sun – it has a distinctive off-flavour. The reason is that milk and other dairy products turn rancid when exposed to light.

Scientists find clues to cancer drug failure

Mar 02, 2015

Cancer patients fear the possibility that one day their cells might start rendering many different chemotherapy regimens ineffective. This phenomenon, called multidrug resistance, leads to tumors that defy ...

Smart crystallization

Mar 02, 2015

A novel nucleating agent that builds on the concept of molecularly imprinted polymers (MIPs) could allow crystallographers access to proteins and other biological macromolecules that are usually reluctant ...

Supersonic electrons could produce future solar fuel

Mar 02, 2015

Researchers from institutions including Lund University have taken a step closer to producing solar fuel using artificial photosynthesis. In a new study, they have successfully tracked the electrons' rapid transit through ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.