Problems of Forensic Sciences 2001 Vol. 47 (XLVII) 333-339
ANALYSIS OF BLACK SPRAY PAINTS BY FOURIER TRANSFORM INFRARED SPECTROMETRY, X-RAY FLUORESCENCE AND VISIBLE MICROSCOPY
Filip GOVAERT, Gilbert de ROY, Bart DECRUYENAERE, Dominique ZIERNICKI
National Institute of Forensic Science, Brussels, Belgium
Streszczenie
Black spray paints from different European manufactures were characterised to investigate various types of criminal offences. A total of 40 black spray paints were analysed by three techniques: 1. Fourier transform infrared spectrometry (FTIR) using the attenuated total reflectance technology (ATR), 2. X-ray fluorescence (XRF) and 3. visible microscopy of a coated surface. The results of the qualitative analysis permitted to classify spray paints according to binder type and elemental composition. A searchable spectral library was created. Variations of the paint composition due to can shaking prior to spraying were taken into consideration. A visible microscopic analysis of a coated surface characterised the morphology of the paint layer leading to a further discrimination of spray paints. The results of the latter analysis strongly depend on the structure of the substrate under a questioned paint coating. This can severely hamper a comparative study.
Słowa kluczowe
Spray paints; Infrared spectroscopy; X-ray fluorescence; Microscopy.