ISSN: 0022-1198
CODEN: JFSCA
Page Count: 6

An Evaluation of the Use of Laser-Induced Infrared Luminescence to Differentiate Writing Inks
Nelson, LK
Student questioned-document examiner and questioned-document examiner, U.S. Army Crime Laboratory (USACIL-CONUS), GA

Horton, RA
Student questioned-document examiner and questioned-document examiner, U.S. Army Crime Laboratory (USACIL-CONUS), GA

(Received 4 June 1990; accepted 23 July 1990)

Abstract

An examination of 56 inks with an argon-ion laser revealed the laser will sometimes stimulate infrared luminescence in inks which did not produce infrared luminescence under the video spectral comparator (VSC-1). This infrared luminescence was always at a higher range (usually 830 to 900 nm) than that found under the VSC-1. This indicates that laser-induced infrared luminescence may be a useful tool in differentiating between inks which otherwise appear similar.

Keywords:
questioned documents, inks, luminescence, ink differentiation

Paper ID: JFS13093J
DOI: 10.1520/JFS13093J
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