Downham Rory P, Brewer Eleigh R, King Roberto S P, Sears Vaughn G
Home Office CAST, Woodcock Hill, Sandridge, St. Albans, Herts AL4 9HQ, UK.
West Technology Forensics, Dalton House, Armstrong Way, Yate, Bristol BS37 5NG, UK.
Forensic Sci Int. 2018 Jul;288:140-158. doi: 10.1016/j.forsciint.2018.04.018. Epub 2018 Apr 26.
An investigation was undertaken to assess the relative effectiveness of five fingermark visualisation process sequences on new, uncirculated £10 polymer banknotes from the Bank of England (BoE). Each sequence was challenged with the visualisation of 64 natural fingermarks on eight banknotes, of which half were aged for 2-3days and half were aged for 12-13days (32 donors contributed in each set). The sequences investigated were; After each process was applied, fingermark development was assessed under primary viewing conditions appropriate to the technique (white light or fluorescence). All samples were also assessed under secondary viewing conditions; provided by the optical processes infrared reflection and long-wave ultraviolet reflection, and by gelatin lifting (with scanning). These additional techniques reduced the interfering effect of the complex banknote backgrounds and improved the contrast of enhanced fingermarks. Overall, with all assessment conditions considered, sequence 4 and sequence 3 visualised the most identifiable quality fingermarks (92.2% and 89.1% respectively). The most effective overall process used singularly was found to be black magnetic powder, provided that reflected infrared was used to image the results (82.8%). Further data analysis revealed that sequence 1 was the most effective sequence for fresh marks (aged 2-3days) when only primary viewing conditions within the visible part of the spectrum are considered. The need for further work which considers the sensitivity of the processes, and how they perform on BoE polymer banknotes that have become worn in circulation, is emphasised.
开展了一项调查，以评估五种指纹可视化处理序列对来自英格兰银行（BoE）的全新、未流通的10英镑聚合物纸币的相对有效性。每个序列都要对八张纸币上的64个自然指纹进行可视化处理，其中一半纸币老化2 - 3天，另一半老化12 - 13天（每组有32名捐赠者提供指纹）。所研究的序列如下；在应用每个处理方法后，在适合该技术的主要观察条件下（白光或荧光）评估指纹显影情况。所有样本还在二次观察条件下进行评估；二次观察条件由光学处理红外反射和长波紫外反射以及明胶提取（并扫描）提供。这些额外的技术减少了复杂纸币背景的干扰效应，并提高了增强指纹的对比度。总体而言，综合所有评估条件，序列4和序列3可视化出的指纹质量最易识别（分别为92.2%和89.1%）。单独使用时，发现最有效的总体处理方法是黑色磁性粉末，前提是使用反射红外对结果进行成像（82.8%）。进一步的数据分析表明，仅考虑光谱可见部分内的主要观察条件时，序列1对于新鲜指纹（老化2 - 3天）是最有效的序列。强调了需要开展进一步的工作，考虑这些处理方法的灵敏度，以及它们在流通中已磨损的英格兰银行聚合物纸币上的表现。
