A comparative study of ballpoint ink ageing parameters using GC/MS.

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State: Public
Version: Author's accepted manuscript
Serval ID
serval:BIB_25B1DC3B8031
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
A comparative study of ballpoint ink ageing parameters using GC/MS.
Journal
Forensic science international
Author(s)
Koenig A., Magnolon S., Weyermann C.
ISSN
1872-6283 (Electronic)
ISSN-L
0379-0738
Publication state
Published
Issued date
07/2015
Peer-reviewed
Oui
Volume
252
Pages
93-106
Language
english
Notes
Publication types: Journal Article ; Research Support, Non-U.S. Gov't
Publication Status: ppublish
Abstract
For more than a decade scientists tried to develop methods capable of dating ink by monitoring the loss of phenoxyethanol (PE) over time. While many methods were proposed in the literature, few were really used to solve practical cases and they still raise much concern within the scientific community. In fact, due to the complexity of ink drying processes it is particularly difficult to find a reliable ageing parameter to reproducibly follow ink ageing. Moreover, systematic experiments are required in order to evaluate how different factors actually influence the results over time. Therefore, this work aimed at evaluating the capacity of four different ageing parameters to reliably follow ink ageing over time: (1) the quantity of solvent PE in an ink line, (2) the relative peak area (RPA) normalising the PE results using stable volatile compounds present in the ink formulation, (3) the solvent loss ratio (R%) calculated from PE results obtained by the analyses of naturally and artificially aged samples, (4) a modified solvent loss ratio version (R%*) calculated from RPA results. After the determination of the limits of reliable measurements of the analytical method, the repeatability of the different ageing parameters was evaluated over time, as well as the influence of ink composition, writing pressure and storage conditions on the results. Surprisingly, our results showed that R% was not the most reliable parameter, as it showed the highest standard deviation. Discussion of the results in an ink dating perspective suggests that other proposed parameters, such as RPA values, may be more adequate to follow ink ageing over time.

Keywords
Questioned documents, ink dating, aging parameters, solvent drying, phenoxyethanol, GC/MS, Ageing parameters, GC/MS, Ink dating, Phenoxyethanol, Questioned documents, Solvent drying
Pubmed
Web of science
Open Access
Yes
Create date
28/10/2014 11:01
Last modification date
20/08/2019 13:04
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