Published Online: 1 January 1982
Page Count: 6
Document analyst, U.S. Postal Inspection Service, Crime Laboratory, Memphis, TN
(Received 8 May 1981; accepted 3 June 1981)
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.
Paper ID: JFS11463J