Forensic analysis of automotive paints by Raman spectroscopy
Article first published online: 19 SEP 2005
Copyright © 2005 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 36, Issue 11, pages 1059–1067, November 2005
How to Cite
De Gelder, J., Vandenabeele, P., Govaert, F. and Moens, L. (2005), Forensic analysis of automotive paints by Raman spectroscopy. J. Raman Spectrosc., 36: 1059–1067. doi: 10.1002/jrs.1408
- Issue published online: 25 OCT 2005
- Article first published online: 19 SEP 2005
- Manuscript Accepted: 25 JUL 2005
- Manuscript Received: 21 APR 2005
- Research Foundation-Flanders.
- Research Council UGent.
- automotive paints;
- forensic science;
In this work, the possible contribution of Raman spectroscopy in forensic science is evaluated, more specifically for the analysis of automotive paint samples. Spectra from paint flakes as well as from cross sections were examined, in order to identify not only the pigments but also binders and extenders in all paint layers. Moreover, the possibility of distinguishing paint samples from different cars was evaluated to assess the use of vibrational spectroscopic techniques in the investigation of a hit-and-run accident.
The presence of rutile and extenders, such as calcite and barium sulphate, could be demonstrated by their characteristic Raman bands. However, the identification of the binder by Raman spectroscopy was hampered: only with additional information from IR analysis could most of the bands in the spectrum be assigned to molecular vibrations of the binders. In contrast, organic pigments, having very distinctive and well-resolved characteristic bands, could easily be identified by comparing the spectra from the basecoat of the sample with spectra from a reference database. Because of these characteristic bands, the basecoat seems to provide the best spectra to distinguish paint samples. Moreover, some paints can also be distinguished by the absence or presence of the bands from calcium carbonate and barium sulphate in the primer surfacer. When recording spectra from paint flakes, Raman bands from the spectra of the clearcoat as well as from the basecoat are obtained. Copyright © 2005 John Wiley & Sons, Ltd.