New fingerprint breakthrough by forensic scientists / Eurekalert.org, 3 June 2008
http://www.eurekalert.org/pub_releases/2008-06/uol-nfb060208.php
"Researchers in the University Department of Chemistry and the Police's scientific support unit have developed the method that enables scientists to 'visualise fingerprints' even after the print itself has been removed. They conducted a study into the way fingerprints can corrode metal surfaces. The technique can enhance – after firing– a fingerprint that has been deposited on a small calibre metal cartridge case before it is fired."