Evaluation of Laser Desorption Mass Spectrometry and UV Accelerated Aging of Dyes on Paper as Tools for the Evaluation of a Questioned Document

    Volume 47, Issue 6 (November 2002)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Published Online: 1 November 2002

    Page Count: 9


    Grim, DM

    Allison, J
    Michigan State University, East Lansing, MI

    Siegel, J
    School of Criminal Justice, Michigan State University, East Lansing, MI

    (Received 8 July 2002; accepted 29 June 2002)

    Abstract

    Laser desorption mass spectrometry (LDMS) may be used for the detection and identification of dyes found in inks. Naturally-aged and artificially-aged blue and black ballpoint pen inks containing the cationic dye methyl violet were analyzed on paper. The average molecular weight of the dye sample was calculated from LD mass spectral data and plotted versus time. The resulting aging curves demonstrate that, as dye degradation increases, the average molecular weight of the dye decreases. Typical variables involved in ink aging, such as the type of paper and ink formulation, were investigated. Results show that these variables influence the rate of dye degradation. Furthermore, UV accelerated aging has been developed and tested as an alternative to thermal approaches.


    Paper ID: JFS15558J

    DOI: 10.1520/JFS15558J

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    Title Evaluation of Laser Desorption Mass Spectrometry and UV Accelerated Aging of Dyes on Paper as Tools for the Evaluation of a Questioned Document
    Symposium , 0000-00-00
    Committee E30