Journal
JOURNAL OF FORENSIC SCIENCES
Volume 61, Issue 3, Pages 706-714Publisher
WILEY-BLACKWELL
DOI: 10.1111/1556-4029.13107
Keywords
forensic science; questioned document examination; printing ink analysis; DART-Q-TOF; ATR-FTIR
Categories
Funding
- Technical Support Working Group (TSWG) [IS-CS-3683]
- Agilent Technologies
- IonSense
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The rise in improved and widely accessible printing technology has resulted in an interest to develop rapid and minimally destructive chemical analytical techniques that can characterize printing inks for forensic document analysis. Chemical characterization of printing inks allows for both discrimination of inks originating from different sources and the association of inks originating from the same source. Direct analysis in real-time mass spectrometry (DART-MS) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) were used in tandem to analyze four different classes of printing inks: inkjets, toners, offset, and intaglio. A total of 319 samples or similar to 80 samples from each class were analyzed directly on a paper substrate using the two methods. DART-MS was found to characterize the semi-volatile polymeric vehicle components, while ATR-FTIR provided chemical information associated with the bulk components of these inks. Complimentary data results in improved discrimination when both techniques are used in succession resulting in > 96% discrimination for all toners, 95% for all inkjets, >92% for all offset, and >54% for all intaglio inks.
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