Nondestructive classification and identification of ballpoint pen inks by Raman spectroscopy for forensic document examinations

Loong Chuen Lee, Muhammad Ismail Ab Samad, Mohamad Azlan Mohd Ismail

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

As a non-destructive analytical method, Raman spectroscopy often provides insufficient information to identify or differentiate the ink used for the preparation of a questioned document. In this study, blue and black ballpoint pen inks deposited on paper substrate were examined in situ by conventional Raman spectroscopy. Inks were successfully classified based on the total number of prominent bands in Raman spectra. It was found that more than 90% of the samples of the same type and color could be differentiated visually using only Raman spectra, i.e. 94 and 95% for blue and black inks, respectively. As a result of this study, a flow chart has been constructed for blue and black ballpoint pen inks allowing their systematic identification. Raman spectroscopy proved to be a fast and precise technique for forensic ink analysis.

Original languageEnglish
Pages (from-to)723-729
Number of pages7
JournalJournal of Analytical Chemistry
Volume71
Issue number7
DOIs
Publication statusPublished - 1 Jul 2016

Fingerprint

Ink
Raman spectroscopy
Raman scattering
Color
Substrates

Keywords

  • ballpoint pen inks
  • forensic ink analysis
  • questioned documents
  • Raman spectroscopy

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this

Nondestructive classification and identification of ballpoint pen inks by Raman spectroscopy for forensic document examinations. / Lee, Loong Chuen; Samad, Muhammad Ismail Ab; Ismail, Mohamad Azlan Mohd.

In: Journal of Analytical Chemistry, Vol. 71, No. 7, 01.07.2016, p. 723-729.

Research output: Contribution to journalArticle

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