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Experimental Protocol to Investigate Particle Aerosolization of a Product Under Abrasion and Under Environmental Weathering
Published on: September 16, 2016
Evaluation of silver mirror chemical delamination on dusted fingermarks
R J Accioly1, E G Silva2, K C Mariotti3
1Departamento de Medicina Legal, Bioética, Medicina do Trabalho, Medicina Física e Reabilitação, Faculdade de Medicina FMUSP, Universidade de São Paulo, São Paulo, SP 01246-903, Brazil; Biometric Identification Group, Brazilian Federal Police, Foz do Iguaçu, PR 85863-720, Brazil.
Abstract:
Airborne substances are common contaminants and often interfere on fingermarks compositions and their development procedures. This study analyzed the efficiency of silver mirror delamination technique to develop fingerprints deposited on mirrors submitted to an airflow. The silver mirror delamination consists of subjecting the mirror into a chemical treatment in order to obtain a transparent substrate and improve the conditions for recording fingerprints with simple photography equipment. The fingerprint images were evaluated with LCMetric software and ACE-V methodology. The results showed that fingerprints suffered severe degradation by dust deposition and mirror delamination assessment was unable to recover the vast majority of fingerprints. However, there were fingermarks that achieved "good" quality score in LCMetric software evaluation and were considered with comparison value by human evaluation (ACE-V), making the mirror delamination procedure suitable as a prior and contactless technique among the attempts to recover the contaminated fingermarks.
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