This article ‘Forensic examination of multilayer white paint by lateral scanning Raman spectroscopy’ was written by S.P. Stewart and S.E.J. Bell (Queen's University, UK), and W.J. Armstrong, G. Kee, and S.J. Speers (FSNI, UK). It is published with the permission of the Controller of HMSO and the Queen's Printer for Scotland.
Forensic examination of multilayer white paint by lateral scanning Raman spectroscopy†
Article first published online: 13 JUL 2011
© 2011 Crown copyright.
Journal of Raman Spectroscopy
Volume 43, Issue 1, pages 131–137, January 2012
How to Cite
Stewart, S.P., Bell, S.E.J., Armstrong, W.J., Kee, G. and Speers, S.J. (2012), Forensic examination of multilayer white paint by lateral scanning Raman spectroscopy. J. Raman Spectrosc., 43: 131–137. doi: 10.1002/jrs.2982
- Issue published online: 27 JAN 2012
- Article first published online: 13 JUL 2011
- Manuscript Accepted: 10 APR 2011
- Manuscript Received: 5 JAN 2011
- white paint;
- lateral scanning;
Multilayer samples of white architectural paint potentially have very high evidential value in forensic casework, because the probability that two unrelated samples will have the same sequence of layers is extremely low. However, discrimination between the different layers using optical microscopy is often difficult or impossible. Here, lateral scanning Raman spectroscopy has been used to chemically map the cross-sections of multilayer white paint chips. It was found that the spectra did allow the different layers to be delineated on the basis of their spectral features. The boundaries between different layers were not as sharp as expected, with transitions occurring over length scales of > 20 µm, even with laser spot diameters < 4 µm. However, the blurring of the boundaries was not so large as to prevent recording and identification of spectra from each of the layers in the samples. This method clearly provides excellent discrimination between different multilayer white paint samples and can readily be incorporated into existing procedures for examination of paint transfer evidence. © 2011 Crown copyright.