Abstract
Questioned document is one of the oldest fields of examination reported in forensic science. Documents are used as physical (nowadays sometimes virtual) traces of human transactions, thus questioning, falsification and counterfeiting certainly have existed since their invention and routine use. This is also the case for biblical texts and art pieces for which authenticity and authorship are often disputed. While mainly handwriting comparison was reported in early works, the composition and characteristics of inks on paper were often briefly discussed (see for example the early works of Demelle or Raveneau in the XVIIe). Since then, many technological developments have impacted questioned document examination, both with regard to the ink and paper production, as well as to the writing instruments or printing techniques. Nowadays, further progress have changed the world of (questioned) documents, through the introduction of virtual documents using electronic signatures and security documents such as passports using mixed physical and digital biometric data. Thus, the document examiner’ expertise has to quickly evolve and adapt to such developments, sometimes necessitating the combination of skills from different disciplines not always co-existing in forensic laboratories (such as chemistry, physics, statistics, engineering, material science, computer science). After a brief overview of the historical development in both ink formulation and analysis, this chapter will investigate the relevance of rapidly evolving technologies for application to the examination of questioned documents in a forensic perspective.
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Notes
- 1.
Chemometrics is the use of statistical methods to extract useful information from chemical data.
- 2.
In brief, the Raman effect is a change in the wavelength of light occurring when a light beam is deflected by molecules, thus yielding information on the structure of the targeted molecules.
- 3.
SERS allows to increase the RAMAN signal of several orders of magnitude (and thus, the sensitivity if the technique) through a particular sample preparation that allow molecules to be adsorbed on metallic surfaces typically made of gold or silver.
- 4.
ATR is a sampling technique using a crystal to reflect the infrared beam of light. It allows measuring surface properties with no sample preparation and for absorbing material it additionally increases the IR signal.
- 5.
DSA uses a ion gun that direct heated nitrogen gas molecules at the samples in a mesh holder.
- 6.
DART uses stream of excited helium or nitrogen to ionize samples directly on the paper substrate.
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Acknowledgements
The authors wish to thank Dr. Raymond Marquis from the School of Criminal Justice of the University of Lausanne for the HPTLC results shown in Fig. 11.1, Prof. Patrick Buzzini from the Department of Forensic Science of Sam Houston State University (Houston, Texas) for providing the Raman data illustrated in Fig. 11.4, Dr. Matteo Gallidabino from the Department of Applied Sciences of Northumbria University for the acquisition of the LDI-MS data represented in Fig. 11.5; Florentin Coppey from the School of Criminal Justice of the University of Lausanne for the production of the hyperspectral imaging for Fig. 11.6, and Prof. Medhi Moini and his team from the Department of Forensic Sciences of the George Washington University for the DART and DSA-MS spectra represented Fig. 11.7.
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Weyermann, C., Techabowornkiat, Ku. (2019). Emerging Approaches in the Analysis of Inks on Questioned Documents. In: Francese, S. (eds) Emerging Technologies for the Analysis of Forensic Traces. Advanced Sciences and Technologies for Security Applications. Springer, Cham. https://doi.org/10.1007/978-3-030-20542-3_11
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