Clarkson Helen, Birch Wendy
UCL Institute of Archaeology, 31-34 Gordon Square, London, WC1H OPY, U.K.
Anatomy Laboratory, University College London, Rockefeller Building 21, University Street, London, WC1E 6JJ, U.K.
J Forensic Sci. 2013 Sep;58(5):1264-1272. doi: 10.1111/1556-4029.12237. Epub 2013 Jul 23.
Any person with a tattoo known to their family or friends could potentially be identified from the presence of such personal identifying markers. Problems in identification utilizing tattoos may arise when these markers are removed or defaced in some way. This paper uses infrared wavelengths at 760, 850, and 950 nm to improve the visualization of laser-removed or covered up tattoos and also to establish whether the ink pigments used can be observed on radiographs from any metal that may be present. The results obtained indicate that some older inks have a high enough metallic content to allow them to be viewed on a radiograph, while infrared light can demonstrate latent ink still present in the skin after laser removal and can also be utilized to distinguish an original tattoo through a secondary "cover-up" tattoo. Infrared photography and radiography have been shown to improve tattoo visualization in a forensic context.
任何家人或朋友知晓其有纹身的人都有可能因这些个人识别标记的存在而被识别出来。当这些标记以某种方式被去除或损毁时，利用纹身进行身份识别可能会出现问题。本文使用760、850和950纳米的红外波长来改善对激光去除或遮盖的纹身的可视化效果，并确定是否能在可能存在的任何金属的X光片上观察到所用的墨水颜料。所获得的结果表明，一些较旧的墨水金属含量足够高，能够在X光片上被看到，而红外光可以显示激光去除后仍存在于皮肤中的隐形墨水，还可用于透过二次“遮盖”纹身辨别原始纹身。在法医背景下，红外摄影和X光摄影已被证明能改善纹身的可视化效果。
