Laser Examination as an Additional Nondestructive Method of Ink Differentiation

    Volume 33, Issue 2 (March 1988)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Published Online: 1 March 1988

    Page Count: 9


    Mooney, D
    Questioned document examiner, Colorado Bureau of Investigation, Denver, CO

    Zimmerman, J
    Questioned document examiner, Aurora Police Department, Aurora, CO

    (Received 23 May 1987; accepted 1 June 1987)

    Abstract

    Twenty-two black, eight blue, and seven red inks were compared using the reflectance and luminescence mode of the Model J infrared instrument and the Laser Photonics, Inc., neodymium yttrium aluminum garnet (Nd:YAG) laser. These thirty-seven inks were compared from writing produced on Cascade Xerographic paper and Dixon Paper Company safety paper. Results indicate that, in addition to the Model J instrument and other traditional nondestructive examinations, Nd:YAG laser examination in several instances produces different results, adding another feasible link to nondestructive processes commonly used. Further, the outcome of the comparison process was affected significantly on some occasions by the type of paper on which the writing appeared.


    Paper ID: JFS11944J

    DOI: 10.1520/JFS11944J

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    Author
    Title Laser Examination as an Additional Nondestructive Method of Ink Differentiation
    Symposium , 0000-00-00
    Committee E30