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The use of laser desorption/ionization mass spectrometry in the analysis of inks in questioned documents
Authors:Siegel Jay  Allison John  Mohr Donna  Dunn Jamie
Institution:a Forensic and Investigative Sciences Program, Indiana University, Purdue University, Indianapolis 402 N. Blackford Street, LD 326 Indianapolis, IN 46202, USA
b Forensic Science Program, The College of New Jersey P.O. Box 7718, Ewing, NJ 08628-0718, USA
c Department of Chemistry, Cedar Crest College 100 College Dr. Allentown, PA 18104, USA
d Michigan State University, Department of Chemistry, East Lansing, MI 48824, USA
Abstract:Determination of the age of a handwritten or ink printed questioned document can be an important consideration in forensic cases. Most often the age of a document is determined by the chemical behavior of the dyes that make up the ink. Exposure of the dyes to environmental factors such as oxygen and ultraviolet or visible light cause them to degrade. Often this degradation can be correlated to the time since the exposure of the ink to the elements began. A number of methods have been used to track the aging of inks on paper. This paper reports the use of laser desorption mass spectrometry as a valuable tool in not only elucidating the structures of dyes used in inks but tracking the change in their chemistry as they age. This study also explores methods for artificially aging documents using ultraviolet and visible light.
Keywords:MALDI  Laser desorption mass spectrometry  Ink analysis  Artificial aging of inks  Ball point pen  Methyl violet
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