Siegel Jay, Allison John, Mohr Donna, Dunn Jamie
Forensic and Investigative Sciences Program, Indiana University, Purdue University, Indianapolis 402 N. Blackford Street, LD 326 Indianapolis, IN 46202, USA.
Talanta. 2005 Aug 15;67(2):425-9. doi: 10.1016/j.talanta.2005.03.028.
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.
在法医案件中，确定手写或油墨印刷可疑文件的年代可能是一个重要的考量因素。大多数情况下，文件的年代是由构成油墨的染料的化学行为来确定的。染料暴露于氧气、紫外线或可见光等环境因素会导致它们降解。通常，这种降解与油墨暴露于这些因素开始后的时间相关。已经使用了多种方法来追踪纸张上油墨的老化情况。本文报道了激光解吸质谱法不仅作为一种有价值的工具用于阐明油墨中所用染料的结构，而且用于追踪它们随着老化而发生的化学变化。本研究还探索了使用紫外线和可见光对文件进行人工老化的方法。
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