Wondergirl
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Forensics: Fingerprints can be recovered from fired bullet casings
http://www.guardian.co.uk/science/2008/jun/03/fingerprints.bullets
Scientists have developed a technique for retrieving fingerprints from bullet casings and bomb fragments after they have been fired or detonated. The new method, which relies on subtle corrosion of metal surfaces is already being applied for the first time anywhere in the world by two British police forces.
The patterns of corrosion remain even after the surface has been cleaned, heated to 600C or even painted over. This means that traces of fingerprints stay on the metal long after the residue from a person's finger has gone.
"All other conventional techniques that the police anywhere in the world would use require some kind of either physical or chemical interaction with the fingerprint residue. So for example if you are using powder the powder sticks to the tackiness in the sweat," said Dr John Bond of the University of Leicester and the Scientific Support Unit of Northamptonshire Police. Instead, the technique he has developed relies on permanent physical changes to the metal.
http://www.guardian.co.uk/science/2008/jun/03/fingerprints.bullets