Some Special Observations Regarding Visible Transmission Spectra of Inks and an Improved Method for Their Discrimination by Microspectrophotometry

    Volume 37, Issue 3 (May 1992)

    ISSN: 0022-1198

    CODEN: JFSOAD

    Published Online: 1 May 1992

    Page Count: 12


    Zeichner, A
    Head and Scientific Officer, Toolmarks and Materials Laboratory, Division of Identification and Forensic Science, Israel Police Headquarters, Jerusalem,

    Glattstein, B
    Head and Scientific Officer, Toolmarks and Materials Laboratory, Division of Identification and Forensic Science, Israel Police Headquarters, Jerusalem,

    Abstract

    Various blue and black inks are shown to change their transmission spectra by applying pressure and smearing them as deposits on glass slides. A similar phenomenon is observed with deposits of copper phthalocyanine tetrasulfonic acid tetra sodium salt. It is shown that transmission spectra of small samples of inked paper fibers smeared (crushed) on glass slides resemble spectra of smeared ink deposits and are more reproducible than spectra of inked fibers in a mounting medium. This advantage is especially significant in the case of examining ink traces on tinted paper.


    Paper ID: JFS11986J

    DOI: 10.1520/JFS11986J

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    Title Some Special Observations Regarding Visible Transmission Spectra of Inks and an Improved Method for Their Discrimination by Microspectrophotometry
    Symposium , 0000-00-00
    Committee E30