Visualization of Sebaceous Fingerprints on Fired Cartridge Cases: A Laboratory Study

Migron, Yoelit; Hocherman, Gil; Springer, Eliot; Almog, Joseph; Mandler, Daniel

doi:10.1520/jfs16180j

Cited by 47 publications

(46 citation statements)

References 2 publications

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“…A displacement reaction occurs with copper replacing the more electropositive ions in the molten salt electrolyte. Other displacement reactions have also been investigated, for example the work of Migron et al using palladium [14].…”

Section: Introductionmentioning

confidence: 99%

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

Wightman

Emery

Austin

et al. 2015

Forensic Science International

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The interaction of fingermark deposits on metals has been examined by a variety of techniques. Visualisation by film growth has been the main area of investigation through: thermal oxidation, anodising, peroxide solution, and the interaction with vapour of iodine and ammonium sulphide. Corrosion of the underlying metal has also been examined as an alternative means of visualisation. Confocal microscopy was used to look at the film thickness and corrosion products around the prints. Scanning electron microscopy and energy dispersion of X-rays (SEM-EDX) examined a number of metal samples to investigate film growth and the elemental distribution. The observations suggest that differential oxidation was occurring as well as corrosion into the metal. Fingermark deposits on metals can corrode into the metal depending on the reactivity of the metal and leave a recoverable mark. However, fingermark deposits can also alter the rate of chemical reaction of the substrate metal by oxidation. In some cases organic matter can inhibit reaction, both when forming an oxide layer and when corroding the metal. However, signs of third level detail from pore contact may also be visible and the monovalent ions from salts could also influence film growth. Whilst further work would need to be carried out to decide whether any of these techniques may have application in fingermark recovery, this study does suggest that fingermarks on metals may be recoverable after incidents such as fires or immersion in water.

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Section: Introductionmentioning

confidence: 99%

The interaction of fingermark deposits on metal surfaces and potential ways for visualisation

Wightman

Emery

Austin

et al. 2015

Forensic Science International

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show abstract

“…Other waterbased development techniques, such as selenous acid [6], ammoniacal silver nitrate [7], palladium salts [8] and gunblueing mixtures [7,9] rely on electrochemical interactions with exposed metal between fingermark ridge deposits to enhance contrast. Such reagents generally work best when the fingermarks are substantially sebaceous in nature and are ineffective in visualising water-soluble eccrine deposits.…”

Section: Introductionmentioning

confidence: 99%

Latent fingermark visualisation using a scanning Kelvin probe

Williams

McMurray

2007

Forensic Science International

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“…It is obvious that this system is controlled by electrochemical processes. The fingerprint material can participate in the process in two ways: corroding the metal surface to produce an etched impression of the ridge detail [20,21] or protect the metallic surface from etching by the electrolyte, to produce a ''reversed'' impression, in which the surface around the latent mark and in the valleys is more intensively etched than the mark itself [22].…”

Section: Discussionmentioning

confidence: 99%