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Updated: Dec 10, 2025

Raman and IR Spectroelectrochemical Methods as Tools to Analyze Conjugated Organic Compounds
Published on: October 12, 2018
Investigation of the new possibility of mathematical processing of Raman spectra for dating documents
K O Gorshkova1, E R Rossinskaya2, N P Kirillova3
1Inter-Regional Economic and Legal Office 1D, 69 Blagodatnaya Str., St. Petersburg 196105, Russia.
Abstract:
The use of spectral analysis methods to determine the age of writing inks is an important forensic task. However, the use of spectral data for this purpose has a number of limitations and difficulties. This paper considers the application of the Raman spectroscopy method to an urgent forensic task. The known mechanisms of dye degradation are analyzed; Raman bands are identified that are related to the age of the sample. In a sample of 5 randomly selected writing inks, temporary markers were identified. Narrow sections of Raman spectra containing characteristic lines were used for analysis. It was shown that processing narrow sections of the Raman spectra using the PCA chemometric method allowed the separation of writing inks into groups (clusters) corresponding to different creation intervals.
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