Latent fingerprint detection using a scanning Kelvin microprobe.

  title={Latent fingerprint detection using a scanning Kelvin microprobe.},
  author={Gareth L. Williams and H N McMurray and Dan Worsley},
  journal={Journal of forensic sciences},
  volume={46 5},
Electrochemical interactions between latent human fingerprints and metal surfaces in ambient air are investigated using a scanning Kelvin microprobe. Inorganic salts present in sweat deposited at fingerprint ridges locally depassivate the metal surface producing a Volta potential decrease of greater than 200 mV. Volta potential patterns may persist for months and prints may be visualized by potential mapping, even when overcoated with a polymer layer. Because the Volta potential differences are… CONTINUE READING

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