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Development of latent fingerprints on metallic surfaces using electropolymerization processes.

C Bersellini¹, L Garofano, M Giannetto

¹Dipartimento di Chimica Generale, Inorganica, Analitica e Chimica Fisica, Università di Parma, Italy.

Journal of Forensic Sciences

|July 14, 2001

Summary

This study introduces a novel method for developing latent fingerprints on metal surfaces, particularly Ergal firearms. The technique utilizes electropolymerization to create a negative image of the fingerprint, offering a complementary forensic tool.

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Area of Science:

Forensic Science
Materials Science
Electrochemistry

Background:

Latent fingerprint development on metal surfaces remains a challenge.
Existing methods have limitations in terms of cost, speed, and effectiveness.
Fingerprints contain fatty acids that can act as insulators on metal surfaces.

Purpose of the Study:

To develop a new, cost-effective method for latent fingerprint visualization on metal items.
To explore the use of electropolymerization for fingerprint enhancement.
To analyze the morphology of the polymer for improved detection.

Main Methods:

Electropolymerization of pyrrole and substituted porphyrins (tetra(o-aminophenyl)porphyrine).
Utilizing the insulating properties of fatty acids in fingerprints.

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Scanning Electron Microscopy (SEM) and Atomic Force Microscopy (AFM) for polymer morphology analysis.

Main Results:

The process generates a negative pattern of the latent fingerprint.
Preliminary results show successful visualization of fingerprints on Ergal.
Polymer morphology correlates with the enhancement process quality.

Conclusions:

The proposed electropolymerization method is a novel approach for developing latent fingerprints on metal surfaces.
This technique is complementary to existing methods, offering low cost, rapidity, and simplicity.
Further research can enhance the success rate of fingerprint detection on challenging substrates.