The classification of ballpoint pen inks in Questioned Documents by using VSC and SERRS

  • Kim, Nam Yee (Dept. of Chemical Analysis, National Institute of Scientific Investigation) ;
  • Park, Sung Woo (National Institute of Scientific Investigation) ;
  • Doble, Philip (Center for Forensic Science, University of Technology) ;
  • Roux, Claude (Center for Forensic Science, University of Technology)
  • Received : 2004.05.09
  • Accepted : 2004.05.21
  • Published : 2004.08.25

Abstract

The aim of this study was to investigate the evidential value of blue and black ballpoint pens on paper by nondestructive techniques. In this work, 21 blue and 22 black ballpoint pens which were purchased on different brands were analyzed by Raman Spectroscopy and Video Spectral Comparator (VSC). Surface-Enhanced Resonance Raman Spectroscopy (SERRS) with excitation at 685 nm and VSC with several spot light filters were used for the discrimination of ballpoint pen inks. In the SERR spectra, the ballpoint pen inks on paper could be shown sharp spectral bands and distinguished by their band shapes and relative intensities. In the blue and black ballpoint pen inks, the discriminating powers (DP) by SERRS were 0.85 and 0.67 and the DP by VSC were 0.88 and 0.90, respectively. The DP by combined sequence of techniques was all 0.97 in both black and blue ballpoint pen inks.

Keywords

Forensic science;Document examination;ballpoint pen inks;SERRS

Acknowledgement

Supported by : Korea Science & Engineering Foundation (KOSEF)

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