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Related Experiment Videos

Latent fingerprint detection using a scanning Kelvin microprobe.

G Williams1, H N McMurray, D A Worsley

  • 1Department of Materials Engineering, University of Wales Swansea, UK.

Journal of Forensic Sciences
|September 25, 2001
PubMed
Summary

Latent human fingerprints leave persistent electrochemical traces on metal surfaces. These Volta potential patterns, caused by sweat salts, can be mapped for months, even after heating, aiding in fingerprint detection.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Forensic Science

Background:

  • Latent fingerprint detection is crucial for forensic investigations.
  • Existing methods often struggle with aged or contaminated prints.
  • Understanding the electrochemical basis of fingerprint residues is needed.

Purpose of the Study:

  • To investigate electrochemical interactions between latent fingerprints and metal surfaces.
  • To explore the longevity and visualization of fingerprint-induced potential changes.
  • To determine the impact of heat on fingerprint residue detection.

Main Methods:

  • Utilized a scanning Kelvin microprobe to measure Volta potential.
  • Analyzed inorganic salt composition in fingerprint residues.

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  • Examined metal surfaces exposed to latent fingerprints in ambient air.

    • Main Results:

    • Inorganic salts in sweat locally depassivated metal surfaces, causing a Volta potential decrease >200 mV.
    • Volta potential patterns persisted for months, allowing visualization via potential mapping.
    • Detection remained possible even after overcoating with polymers or volatilizing organic components by heating to 600°C.

    Conclusions:

    • Electrochemical interactions, driven by involatile salts, provide a persistent fingerprint signature.
    • Volta potential mapping offers a durable method for latent fingerprint visualization.
    • This technique shows potential for forensic applications, especially for aged or thermally treated samples.