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Grim DM, Siegel J, Allison J. Evaluation of laser desorption mass spectrometry and UV accelerated aging of dyes on paper as tools for the evaluation of a questioned document. J Forensic Sci. 2002;47(6):1265-73
Grim, D. M., Siegel, J., & Allison, J. (2002). Evaluation of laser desorption mass spectrometry and UV accelerated aging of dyes on paper as tools for the evaluation of a questioned document. Journal of forensic sciences, 47(6), 1265-73.
Grim, Donzna M, et al. "Evaluation of laser desorption mass spectrometry and UV accelerated aging of dyes on paper as tools for the evaluation of a questioned document." Journal of forensic sciences vol. 47,6 (2002): 1265-73.
Grim DM, Siegel J, Allison J. Evaluation of laser desorption mass spectrometry and UV accelerated aging of dyes on paper as tools for the evaluation of a questioned document. J Forensic Sci. 2002 Nov;47(6):1265-73. PMID: 12455647.
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J Forensic Sci. 2002 Nov;47(6):1265-73.

Evaluation of laser desorption mass spectrometry and UV accelerated aging of dyes on paper as tools for the evaluation of a questioned document.

Journal of forensic sciences

Donzna M Grim, Jay Siegel, John Allison

Affiliations

  1. Department of Chemistry, Michigan State University, East Lansing 48824-1322, USA.

PMID: 12455647

Abstract

Laser desorption mass spectrometry (LDMS) may be used for the detection and identification of dyes found in inks. Naturally-aged and artificially-aged blue and black ballpoint pen inks containing the cationic dye methyl violet were analyzed on paper. The average molecular weight of the dye sample was calculated from LD mass spectral data and plotted versus time. The resulting aging curves demonstrate that, as dye degradation increases, the average molecular weight of the dye decreases. Typical variables involved in ink aging, such as the type of paper and ink formulation, were investigated. Results show that these variables influence the rate of dye degradation. Furthermore, UV accelerated aging has been developed and tested as an alternative to thermal approaches.

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