Journal Published Online: 01 March 1991
Volume 36, Issue 2

Detection of Nonvisible Writings by Infrared Luminescence and Ultraviolet Fluorescence

CODEN: JFSCAS

Abstract

The presence of nonvisible written material was detected on documents during an examination for infrared luminescence. An experiment was conducted to examine absorption by paper of noncolor ink components from documents bearing written material. Various inks were used to prepare sample writings. Each sample writing was prepared on an original sheet of paper with a corresponding undershcet. These sheets were then placed between upper and lower protective sheets. Each four-sheet sample was left intact for a 72-h period. The presence of nonvisible writing resulting from the absorption by paper of noncolor ink components was detected on particular sample sheets when examined for ultraviolet fluorescence and infrared luminescence. The methods used and the results are discussed.

Author Information

Riordan, WM
Internal Revenue Service, National Forensic Laboratory, Chicago, IL
Pages: 4
Price: $25.00
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Details
Stock #: JFS13048J
ISSN: 0022-1198
DOI: 10.1520/JFS13048J