Pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) is a reliable analytical technique capable of characterizing a wide range of organic materials, yet even reasonably experienced users can be intimidated by the challenges of data interpretation. An expert system utilizing AMDIS (Automated Mass Spectral Deconvolution and Identification System, available from NIST) for marker compound identification and Excel for data interpretation was developed at the Getty Conservation Institute that facilitates accurate characterization of synthetic paint media. The system, which incorporates knowledge from Py-GC/MS experts about marker compounds along with guidelines on how to interpret their distributions in paint samples, can benefit paint chemists and forensic examiners of trace evidence.
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