Volume 37, Issue 2 (March 1992)

    Analysis of Ballpoint Pen Inks by Diffuse Reflectance Infrared Spectrometry

    (Received 20 July 1991; accepted 4 September 1991)

    CODEN: JFSOAD

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    Abstract

    The primary method for the analysis of inks is thin-layer chromatography (TLC), which only permits comparison of dye components. Studies have been done on the usefulness of diffuse reflectance (DR) with Fourier transform infrared (FT-IR) spectrometry, using a direct deposit sampling technique for the analysis of ballpoint pen inks. This technique allows screening of a composite ink as a whole, including its dye components, resins, and other additives. A total of 184 ink samples were analyzed by FT-IR, and searchable spectral libraries were created of both whole and extracted inks. The results indicate that the additional information provided by the DR analysis, combined with the complementary information from the TLC analysis, provides enhanced value to the forensic examination of inks.


    Author Information:

    Bartick, EG
    Chemist and research chemist, Forensic Science Research Unit, FBI Laboratory, FBI Academy, Quantico, VA

    Merrill, RA
    Chemist and research chemist, Forensic Science Research Unit, FBI Laboratory, FBI Academy, Quantico, VA


    Stock #: JFS13260J

    ISSN: 0022-1198

    DOI: 10.1520/JFS13260J

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    Title Analysis of Ballpoint Pen Inks by Diffuse Reflectance Infrared Spectrometry
    Symposium , 0000-00-00
    Committee E30