Forensic Analysis of Automotive Paints using Spectroscopy
Summary
Forensic analysis of automotive paints relies on the detailed chemical and physical characterisation of multi-layered paint chips and smears to link trace evidence to specific vehicles, manufacturers or production batches. Modern automotive coatings consist of primer, basecoat and clearcoat layers, each incorporating unique combinations of polymers, pigments, fillers and additives. Spectroscopic techniques such as Fourier transform infrared (FTIR) spectroscopy, Raman microspectrometry and X-ray based methods enable non-destructive or minimally invasive identification of molecular and elemental constituents. When combined with microscopy, spectral imaging and chemometric algorithms, these methods can resolve layer thicknesses, reveal polymer resin types, distinguish inorganic pigments and generate robust spectral fingerprints. Advances in portable spectrometers, high-resolution imaging and machine-learning classification have accelerated on-scene and laboratory workflows, enhancing the speed and accuracy of hit-and-run investigations, accident reconstruction and vehicular identification on a global scale.
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Forensic Analysis of Automotive Paints using Spectroscopy publication trend
The graph below shows the total number of articles in forensic analysis of automotive paints using spectroscopy across all publications each year (not limited to Nature Index journals).
Technical terms
Attenuated total reflectance-FTIR spectroscopy (ATR-FTIR): A variant of infrared spectroscopy that measures molecular vibrations by pressing a sample against an internal-reflection crystal, yielding surface-sensitive spectral fingerprints.
Raman microspectrometry: A laser-based technique that detects inelastic scattering of light to identify molecular structures and inorganic pigments at microscopic scales.
Scanning electron microscopy with energy-dispersive X-ray spectrometry (SEM-EDX): A combined imaging and analytical method that reveals surface morphology and elemental composition by detecting characteristic X-rays emitted under electron bombardment.
Pyrolysis-gas chromatography-mass spectrometry (Py-GC/MS): A destructive approach in which thermal decomposition products of polymeric binders are separated by gas chromatography and identified by mass spectrometry, useful for detailed resin analysis.
Wavelength dispersive X-ray fluorescence (WDXRF): An elemental analysis technique that measures fluorescent X-rays diffracted by a crystal to quantify trace metals and inorganic pigments in paint samples.
References
- Multi-Modal Compositional Analysis of Layered Paint Chips of Automobiles by the Combined Application of ATR-FTIR Imaging, Raman Microspectrometry, and SEM/EDX. Molecules (2019).
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