Volume 38, Issue 1 (January 1993)

    The pH Pen—A Means of Comparing Paper Products

    (Received 24 April 1991; accepted 17 June 1992)

    CODEN: JFSOAD

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    Abstract

    Printers may use a pH pen to test the alkaline/acid content of paper stock to determine if it will be compatible with a given formulation of printing ink. Questioned-document examiners may find the pH pen useful as an additional discriminator when attempting to determine if two paper products (known and questioned) could have originated from a common source. A total of 68 different fine white paper products were compared. From a total of 2278 possible pairs (questioned and known), all but six pairs were discriminated by a combination of physical characteristics, fluorescence under UV light, and the pH pen.


    Author Information:

    Gernandt, MN
    Senior Chemist and Forensic Document Examiner, Naval Investigative Service Regional Forensic Laboratory, San Diego, California

    Blackledge, RD
    Senior Chemist and Forensic Document Examiner, Naval Investigative Service Regional Forensic Laboratory, San Diego, California


    Stock #: JFS13385J

    ISSN: 0022-1198

    DOI: 10.1520/JFS13385J

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    Author
    Title The pH Pen—A Means of Comparing Paper Products
    Symposium , 0000-00-00
    Committee E30