Payne Gemma, Reedy Brian, Lennard Chris, Comber Bruce, Exline David, Roux Claude
Centre for Forensic Science, University of Technology Sydney, PO Box 123, Broadway, NSW 2007, Australia.
Forensic Sci Int. 2005 May 28;150(1):33-51. doi: 10.1016/j.forsciint.2004.06.036.
This study investigated the application of chemical imaging to the detection of latent fingerprints using the Condor macroscopic chemical imaging system (ChemImage Corp., Pittsburgh, USA). Methods were developed and optimised for the visualisation of untreated latent fingerprints and fingerprints processed with DFO, ninhydrin, cyanoacrylate, and cyanoacrylate plus rhodamine 6G stain. The results obtained with chemical imaging were compared to the detection achieved using conventional imaging techniques. The Condor significantly improved the detection of many prints, especially those that might be considered poor quality or borderline prints. Prints on newspaper treated with ninhydrin and DFO, and prints on white and yellow paper treated with ninhydrin, benefited the most from chemical imaging detection. In many cases, fingerprints undetectable using conventional imaging techniques could be visualised with chemical imaging. Ridge detail from untreated prints on yellow paper was also detected using the Condor. When prints of high quality were examined, both detection techniques produced quality results. The results of this project demonstrate that chemical imaging offers advantages over conventional visualisation techniques when examining latent fingerprints, especially those that would be considered difficult, such as weak prints or prints on surfaces that produce highly luminescent backgrounds. Standard testing procedures for the detection and enhancement of fingerprints by chemical imaging are presented and discussed.
本研究使用秃鹰宏观化学成像系统（美国匹兹堡的ChemImage公司），调查了化学成像在检测潜在指纹方面的应用。针对未经处理的潜在指纹以及用DFO、茚三酮、氰基丙烯酸酯和氰基丙烯酸酯加罗丹明6G染色处理过的指纹的可视化，开发并优化了相关方法。将化学成像获得的结果与使用传统成像技术的检测结果进行了比较。秃鹰系统显著提高了许多指纹的检测效果，尤其是那些可能被认为质量较差或处于临界状态的指纹。用茚三酮和DFO处理过的报纸上的指纹，以及用茚三酮处理过的白色和黄色纸张上的指纹，从化学成像检测中受益最大。在许多情况下，使用传统成像技术无法检测到的指纹可以通过化学成像可视化。使用秃鹰系统也检测到了黄色纸张上未经处理的指纹的纹路细节。当检查高质量指纹时，两种检测技术都产生了高质量的结果。该项目的结果表明，在检查潜在指纹时，尤其是那些被认为困难的指纹，如模糊指纹或在产生高发光背景的表面上的指纹，化学成像比传统可视化技术具有优势。本文还介绍并讨论了通过化学成像检测和增强指纹的标准测试程序。
