Downham Rory P, Brewer Eleigh R, King Roberto S P, Luscombe Aoife M, Sears Vaughn G
CAST, Woodcock Hill, Sandridge, St. Albans, Herts, AL4 9HQ, UK.
West Technology Systems Ltd, Dalton House, Grest Western Business Park, Armstrong Way, Yate, Bristol, BS37 5NG, UK.
Forensic Sci Int. 2017 Jun;275:30-43. doi: 10.1016/j.forsciint.2017.02.026. Epub 2017 Mar 4.
Experiments were conducted to investigate the effectiveness of a range of fingermark visualisation processes on brand new, uncirculated, £5 polymer banknotes (and their test note predecessors), as produced by the Bank of England (BoE). In the main study of this paper, a total of 14 individual processes were investigated on BoE £5 polymer banknotes, which included both 'Category A' processes (as recommended in the Home Office Fingermark Visualisation Manual) as well as recently developed processes, including fpNatural 2 powder (cuprorivaite) from Foster+Freeman and a vacuum metal deposition sequence that evaporates silver followed by zinc. Results from this preliminary investigation indicate that fpNatural 2, multimetal deposition, Wet Powder Black, iron oxide powder suspension and black magnetic powder are the most effective processes on these uncirculated £5 BoE polymer banknotes, when viewed under "primary viewing" conditions (white light or fluorescence). Additional fingermarks were visualised on the polymer banknotes following the subsequent use of reflected infrared imaging and lifting techniques, and with the benefit of these techniques taken into consideration, the aforementioned processes remained amongst the most effective overall. This work provides initial insight into fingermark visualisation strategies for BoE £5 polymer banknotes, and the need for further studies in order to generate mature operational guidance is emphasised.
开展了多项实验，以研究一系列指纹可视化方法对全新、未流通的英国央行发行的5英镑聚合物纸币（及其测试纸币前身）的有效性。在本文的主要研究中，对英国央行5英镑聚合物纸币总共研究了14种不同的方法，其中包括“ A类”方法（如英国内政部《指纹可视化手册》中所推荐的）以及最近开发的方法，包括Foster+Freeman公司的fpNatural 2粉末（铜绿矾）和一种先蒸发银再蒸发锌的真空金属沉积程序。这项初步调查的结果表明，在“主要观察”条件下（白光或荧光）观察时，fpNatural 2、多金属沉积、湿粉黑色、氧化铁粉末悬浮液和黑色磁性粉末是这些未流通的英国央行5英镑聚合物纸币上最有效的方法。在随后使用反射红外成像和提取技术后，聚合物纸币上的其他指纹也显现出来，考虑到这些技术的作用，上述方法总体上仍然是最有效的方法之一。这项工作为英国央行5英镑聚合物纸币的指纹可视化策略提供了初步见解，并强调需要进一步开展研究以制定成熟的操作指南。
