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NCJRS Abstract

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NCJ Number: 235803 Find in a Library
Title: Effect That the Relative Abundance of Copper Oxide and Zinc Oxide Corrosion Has On the Visualization of Fingerprints Formed From Fingerprint Sweat Corrosion of Brass
Journal: Journal of Forensic Sciences  Volume:56  Issue:4  Dated:July 2011  Pages:999-1002
Author(s): John W. Bond, D.Phil
Date Published: July 2011
Page Count: 4
Type: Report (Study/Research)
Format: Article
Language: English
Country: United States of America
Annotation: This study examined latent fingerprints on metal surfaces.
Abstract: From an examination of the fingerprint sweat corrosion of 40 different individuals on phase brass, the study shows that an increase in visualization can be achieved by applying a negative potential to the brass followed by the introduction of a conducting powder. Previously, this technique has been demonstrated only for a positive applied potential and a corrosion product that was dominated by p-type copper (I) oxide. X-ray photoelectron and Auger electron spectroscopic analyses of the surface of the corroded brass show that an increase in visualization with a negative applied potential corresponds with an increase in the concentration of n-type zinc oxide relative to p-type copper (I) oxide with the Cu:Zn ratio less than 0.8:1. Work function conditions for the formation of an n-type zinc oxide/brass rectifying Schottky barrier are fulfilled. (Published Abstract)
Main Term(s): Criminology
Index Term(s): Fingerprint detection techniques; Fingerprint image quality; Fingerprints; Latent fingerprints
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