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Development of latent fingerprints using a corona discharge
1Electrical Discharge and Plasma Laboratory, Faculty of Engineering, Tel-Aviv University, Ramat-Aviv, Israel.
Journal of Forensic Sciences
|September 26, 1997
Summary
A new method uses plasma discharge to develop latent fingerprints on metal surfaces. This technique relies on oxidation of the fingerprint background, making latent prints visible for forensic analysis.
Area of Science:
- Forensic Science
- Plasma Physics
- Surface Chemistry
Background:
- Latent fingerprint development is crucial for forensic investigations.
- Existing methods may have limitations in terms of substrate compatibility or chemical usage.
- Novel techniques are needed to enhance fingerprint visualization.
Purpose of the Study:
- To present a novel method for latent fingerprint development using corona discharge induced plasma.
- To investigate the effectiveness of this technique on various metallic substrates under diverse conditions.
- To elucidate the underlying chemical mechanism of fingerprint development.
Main Methods:
- Fingerprint-bearing objects were placed in a corona discharge plasma.
- Real and artificial fingerprints on metallic substrates were developed.
- X-ray photoelectron spectroscopy (XPS) was used to analyze the surface chemistry.
- Process parameters such as electrode gap, voltage, and pulse frequency were optimized.
Main Results:
- The technique successfully developed latent fingerprints on metallic substrates.
- Fingerprint visualization is achieved through the oxidation of the background.
- Saturated fatty acids in fingerprints act as a protective layer, preventing oxidation.
- Optimization of discharge parameters improved fingerprint visibility.
Conclusions:
- Corona discharge plasma offers a novel and effective method for latent fingerprint development.
- The mechanism involves selective oxidation of the substrate, with fingerprint residues providing protection.
- This technique shows promise for forensic applications, particularly on metallic surfaces.
