Fluorescent fingerprint

Print edition : July 26, 2013

Images of a fingermark left on a stainless steel substrate following enhancement by electro-deposition of polypyrrole. The light regions are stainless steel protected by the sweat residue. Photo: STFC

A 3D optical microscope image of the part of the fingerprint in the previous image shows the fingerprint ridges (as light areas) and the deposited polymer (as dark areas).

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