Volume 58, Issue 5 pp. 1314-1321
Technical Note

Microwave Selective Thermal Development of Latent Fingerprints on Porous Surfaces: Potentialities of the Method and Preliminary Experimental Results

Roberto Rosa Ph.D.

Corresponding Author

Roberto Rosa Ph.D.

Interdepartmental Center for Research on Security and Safety (CRIS), Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, via Vignolese 905, 41125 Modena, Italy

Additional information and reprint requests:

Roberto Rosa, Ph.D.

Department of Engineering “Enzo Ferrari”

University of Modena and Reggio Emilia

via Vignolese 905

Modena 41125

Italy

E-mail: [email protected].

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Paolo Veronesi Ph.D.

Paolo Veronesi Ph.D.

Interdepartmental Center for Research on Security and Safety (CRIS), Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, via Vignolese 905, 41125 Modena, Italy

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Cristina Leonelli Ph.D.

Cristina Leonelli Ph.D.

Interdepartmental Center for Research on Security and Safety (CRIS), Department of Engineering “Enzo Ferrari”, University of Modena and Reggio Emilia, via Vignolese 905, 41125 Modena, Italy

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First published: 18 July 2013
Citations: 1
Presented in part at the American Academy of Forensic Sciences Annual Meeting, February 20–25, 2012, in Atlanta, GA.

Abstract

The thermal development of latent fingerprints on paper surfaces is a simple, safe, and chemicals-free method, based on the faster heating of the substrate underlying the print residue. Microwave heating is proposed for the first time for the development of latent fingerprints on cellulose-based substrate, in order to add to the thermal development mechanism the further characteristic of being able to heat the fingerprint residues to a different extent with respect to the substrate, due to the intrinsic difference in their dielectric properties. Numerical simulation was performed to confirm and highlight the selectivity of microwaves, and preliminary experimental results point out the great potentialities of this technique, which allowed developing both latent sebaceous-rich and latent eccrine-rich fingerprints on different porous surfaces, in less than 30 sec time with an applied output power of 500 W. Microwaves demonstrated more effectiveness in the development of eccrine-rich residues, aged up to 12 weeks.

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