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Appl. Sci. 2017, 7(10), 991; doi:10.3390/app7100991

Analysis of the Aging Processes of Writing Ink: Raman Spectroscopy versus Gas Chromatography Aspects

1
Chamber of Judicial Experts (Sudex), Moscow 127018, Russia
2
Institute of Chemistry, Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
3
LLC Inter-Regional Economic and Legal Office, St. Petersburg, Russia
4
Department of Criminal Law, Saint Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
5
LLC Laser Chemistry, St. Petersburg, Russia
*
Author to whom correspondence should be addressed.
Received: 23 August 2017 / Revised: 14 September 2017 / Accepted: 19 September 2017 / Published: 26 September 2017
(This article belongs to the Section Chemistry)
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Abstract

This work is devoted to the extremely popular but poorly developed scientific and forensic problem of the estimation of the actual dates of inscriptions placed on paper and made by ballpoint pens. It is shown that the degradation of writing inks with time may be controlled via Raman spectroscopy and gas chromatography. The time intervals for the implementation of each of these methods were determined using the ratios of the Raman peak intensities as degradation characteristics rather than their absolute values. In turn, this eliminates the effect of the concentration of a dye. The mutual influence of the volatile components and dyes of writing inks was also investigated and the time interval within which such influence is critical was found. According to the obtained results, a new methodological scheme for determining the age of documents, which were created at least 40 months ago, was proposed. View Full-Text
Keywords: dye; pigment; Raman spectroscopy; gas chromatography; writing inks; criminology dye; pigment; Raman spectroscopy; gas chromatography; writing inks; criminology
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Grechukha, N.M.; Gorshkova, K.O.; Panov, M.S.; Tumkin, I.I.; Kirillova, E.O.; Lukianov, V.V.; Kirillova, N.P.; Kochemirovsky, V.A. Analysis of the Aging Processes of Writing Ink: Raman Spectroscopy versus Gas Chromatography Aspects. Appl. Sci. 2017, 7, 991.

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