An Evaluation of the Use of Laser-Induced Infrared Luminescence to Differentiate Writing Inks

    Volume 36, Issue 3 (May 1991)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Page Count: 6


    Nelson, LK
    Student questioned-document examiner and questioned-document examiner, U.S. Army Crime Laboratory (USACIL-CONUS), Ft. Gillem, GA

    Horton, RA
    Student questioned-document examiner and questioned-document examiner, U.S. Army Crime Laboratory (USACIL-CONUS), Ft. Gillem, GA

    (Received 4 June 1990; accepted 23 July 1990)

    Abstract

    An examination of 56 inks with an argon-ion laser revealed the laser will sometimes stimulate infrared luminescence in inks which did not produce infrared luminescence under the video spectral comparator (VSC-1). This infrared luminescence was always at a higher range (usually 830 to 900 nm) than that found under the VSC-1. This indicates that laser-induced infrared luminescence may be a useful tool in differentiating between inks which otherwise appear similar.


    Paper ID: JFS13093J

    DOI: 10.1520/JFS13093J

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    Title An Evaluation of the Use of Laser-Induced Infrared Luminescence to Differentiate Writing Inks
    Symposium , 0000-00-00
    Committee E30