Latent Fingerprint Detection Using a Scanning Kelvin Microprobe

    Volume 46, Issue 5 (September 2001)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Page Count: 8


    Worsley, DA
    University of Wales Swansea, Singleton park, Swansea,

    Williams, G
    University of Wales Swansea, Singleton park, Swansea,

    Neil McMurray, H
    University of Wales Swansea, Singleton park, Swansea,

    (Received 19 July 2000; accepted 23 October 2000)

    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.


    Paper ID: JFS15103J

    DOI: 10.1520/JFS15103J

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    Author
    Title Latent Fingerprint Detection Using a Scanning Kelvin Microprobe
    Symposium , 0000-00-00
    Committee E30