Gold nanoparticles reveal fingerprints
Recovering fingerprints from paper is a common task for forensic scientists, but often the developed marks are faint. A common approach, therefore, is to use a developing agent that sticks to the clean paper substrate, rather than the fingerprint itself, yielding a reversed image.
The technique described in this study is much less affected by sweat composition, and could improve the yield of latent fingerprints.
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