Journal Published Online: 01 September 2001
Volume 46, Issue 5

Latent Fingerprint Detection Using a Scanning Kelvin Microprobe

CODEN: JFSCAS

Abstract

Electrochemical interactions between latent human fingerprints and metal surfaces in ambient air are investigated using a scanning Kelvin microprobe. Inorganic salts present in sweat deposited at fingerprint ridges locally depassivate the metal surface producing a Volta potential decrease of greater than 200 mV. Volta potential patterns may persist for months and prints may be visualized by potential mapping, even when overcoated with a polymer layer. Because the Volta potential differences are produced by involatile salts they persist when the organic components of the fingerprint residue have been volatilized by heating to 600°C.

Author Information

Williams, G
University of Wales Swansea, Singleton park, Swansea, U.K.
Neil McMurray, H
University of Wales Swansea, Singleton park, Swansea, U.K.
Worsley, DA
University of Wales Swansea, Singleton park, Swansea, U.K.
Pages: 8
Price: $25.00
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Stock #: JFS15103J
ISSN: 0022-1198
DOI: 10.1520/JFS15103J