Investigation of the new possibility of mathematical processing of Raman spectra for dating documents

K. O. Gorshkova, E. R. Rossinskaya, N. P. Kirillova, A. A. Fogel, S. V. Kochemirovskaia, V. A. Kochemirovsky

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Pages (from-to)451-465
Number of pages15
JournalScience and Justice
Volume60
Issue number5
DOIs
StatePublished - Sep 2020

Scopus subject areas

  • Pathology and Forensic Medicine

Keywords

  • Ballpoint pen inks
  • Document dating
  • Forensic examination of documents
  • Principal component analysis (PCA)
  • Raman spectroscopy
  • Writing inks

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