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    Volume 27, Issue 1 (January 1982)

    Illusions of Tracing

    (Received 8 May 1981; accepted 3 June 1981)

    Published Online: 1982


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    Numerous explainable phenomena occur in handwriting that give the product the illusion of being a tracing. This paper exposes various illusions of tracing by describing specific case studies that include diffusion of ink components viewed under infrared luminescence, “sister” lines, rough writing surfaces, writing machines, and plastic lamination. Also discussed is a common principle that exposes illusions.

    Author Information:

    Vastrick, TW
    Document analyst, U.S. Postal Inspection Service, Crime Laboratory, Memphis, TN

    Stock #: JFS11463J


    DOI: 10.1520/JFS11463J

    Title Illusions of Tracing
    Symposium ,
    Committee E30