dstates writes "Scientists at the University of Leicester have developed a new method to recover fingerprints on metallic objects such as bullet cartridges, guns and bomb fragments, even after the surface has been wiped clean. The technique relies on subtle corrosion of metal surfaces caused by sweat and biological residues. To visualize the patterns, high voltage is passed through the metal while sprinkling a fine conducting powder on it. The current causes the powder to stick to the corroded areas. The patterns of corrosion remain even after the surface has been cleaned, heated to 600C or even painted over. Wonder how many cold cases this is going to open up?"
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