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Whodunnit? Enhanced image of fingermark on stainless steel.
Image of a fingermark left on stainless steel, following enhancement by electrodeposition of polypyrrole. The light regions are stainless steel that was protected by the sweat residue that was laid on top, preventing the polymer depositing onto it. The dark regions are the polymer in between the fingerprint sweat deposits, without the fluorescence 'turned on'. Credit:
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