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Research Articles

Sequence determination between blue ballpoint pens and toner using MikrosilTM casting of the intersection

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Pages 184-205 | Received 06 May 2019, Accepted 23 Sep 2019, Published online: 11 Nov 2019
 

Abstract

A technique was developed and assessed for use in the determination of line crossing sequence. This technique takes advantage of the transfer of both substrate topography and ink chemistry, at the line crossing intersection, to a Mikrosil™ casting compound. An initial pilot involving intersections between blue ballpoint inks and toner was constructed and blind tested using Forensic Document Examiners at the Canada Border Services Agency. Following this initial pilot, a more extensive trial was constructed to assess the technique’s application with a larger population of blue ballpoint pens and a larger number of document examiners.

Résumé

Une technique a été développée et évaluée afin de déterminer la séquence de croisements de traits. Cette technique implique le moulage de l’intersection par MikrosilTM et tire profit du transfert à la fois de la topographie du substrat et de la composition chimique des encres. Une étude initiale comportant des intersections entre du toner et des encres bleues de stylo-bille a d’abord été testée à l’aveugle par des examinateurs judiciaire de documents de l’Agence des services frontaliers du Canada. Suite à cette étude, une phase expérimentale plus approfondie a permis d’évaluer la technique sur un plus grand échantillonnage de stylo-bille bleus ainsi qu’un plus grand nombre d’examinateurs de documents.

Disclosure statement

No potential conflict of interest was reported by the authors.

Notes

1 It is very important to note that, unless otherwise indicated, all references to “luminescence” in this paper refer to luminescence as it is observed on the Mikrosil™ cast and not luminescence of the ink on paper.

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