Hallez Florine, Ledroit Pierre, Henrot Damien, Malo Marianne, Tamisier Laurent
University Pierre and Marie Curie, Paris, France; Forensic Science Laboratory of the French Gendarmerie, 5 boulevard de l'Hautil, BP60036 Eragny, 95001 Cergy Pontoise Cedex, France.
Forensic Science Laboratory of the French Gendarmerie, 5 boulevard de l'Hautil, BP60036 Eragny, 95001 Cergy Pontoise Cedex, France.
Forensic Sci Int. 2019 May;298:20-33. doi: 10.1016/j.forsciint.2019.02.055. Epub 2019 Mar 7.
Thermal papers, commonly used for printed receipts or lottery tickets, are omnipresent in our everyday life. They are regarded as semi-porous substrates, and yet can be critical to analyze when looking for latent fingermarks due to their thermosensibility. The aim of this study was to investigate a development sequence that would better combine the adequate detection techniques in order to maximize the chances to develop latent fingermarks left on these substrates. Different methods of development have been compared on test substrates: black magnetic powder, Lumicyano™, thermal development, ninhydrin and 1,2-indanedione/ZnCl. Whitening stages and thermal development have been focused on, tested and optimized. The results of these preliminary tests enabled the study of three development sequences. They have subsequently been compared to the one currently used in the Gendarmerie's laboratories and the best results have been provided during pseudo-operational comparative trials by one of these sequences, consisting in 6 stages.
热敏纸常用于打印收据或彩票，在我们的日常生活中随处可见。它们被视为半多孔基材，但由于其热敏性，在寻找潜在指纹时可能至关重要。本研究的目的是研究一种显影顺序，该顺序能更好地结合适当的检测技术，以最大限度地提高在这些基材上显影潜在指纹的机会。在测试基材上比较了不同的显影方法：黑色磁性粉末、Lumicyano™、热显影、茚三酮和1,2 - 茚二酮/氯化锌。重点关注、测试并优化了增白阶段和热显影。这些初步测试的结果促成了三种显影顺序的研究。随后将它们与宪兵实验室目前使用的顺序进行了比较，其中一种由6个阶段组成的顺序在模拟操作比较试验中提供了最佳结果。
