热敏纸表面潜在汗液手印显现方法研究  

Research on the Display Method of Latent Sweat Fingerprint on the Surface of Thermosensitive Paper

作　　者：刘嘉伟 杨琳 LIU Jia-wei;YANG Lin(Criminal Technology Department,Liaoning Police College,Dalian Liaoning 116036,China)

机构地区：[1]辽宁警察学院刑事技术系,辽宁大连116036

出　　处：《辽宁警察学院学报》2020年第6期58-62,共5页Journal of Liaoning Police College

摘　　要：热敏纸因具有高保存性、信息可视、可快速打印、图文反差良好等特点而被广泛应用在超市收银、高铁票打印、快递单打印等领域中。在各类案件现场,遗留在热敏纸上的潜在手印出现率也呈上升趋势,但由于热敏纸种类繁多,其上的汗潜手印的显现一直是刑事技术工作者所面临的难题。利用502胶熏显法、粉末显现法、多波段光源显现法、茚三酮溶液显现法分别显现高铁票、超市小票、快递单上遗留时间为1天、7天和15天的汗潜手印,对显现结果进行比较分析。实验结果表明:对于嫌疑人遗留的高铁票、超市小票、快递单上的新鲜汗液手印遗留,可优先选择粉末刷显法,手印遗留时间越短,显现效果越显著;对于遗留时间较长的汗液手印,可优先选择茚三酮溶液喷显法;对于遗留在高铁票背面黑色背景上的汗液手印,可优先选择502胶熏显法。Thermosensitive paper is widely used in supermarket cash register,high-speed railway ticket printing,express bill printing and other fields because of its characteristics of high preservation,information visualization,fast printing and good contrast between graphics and text.At the scene of all kinds of cases,the rate of latent fingerprints left on the thermosensitive paper is also on the rise,but because of the variety of thermosensitive paper,the appearance of sweat latent fingerprints has always been a problem faced by criminal technicians.502 glue fumigation method,powder method,multi-band light source method and ninhydrin solution method were used to show the sweat latent fingerprints left on the high-speed railway ticket,supermarket ticket and express bill for one day,seven days and 15 days respectively.The results were compared and analyzed.The experimental results show that:for the fresh sweat fingerprints left on the suspect’s high-speed railway ticket,supermarket ticket and express bill,the powder brushing method can be preferred,and the shorter the time left,the more significant the effect;for the sweat fingerprints left for a long time,the ninhydrin solution spraying method can be preferred;for the sweat fingerprints left on the black background on the back of high-speed railway ticket,the 502 glue fumigation method is preferred.

关 键 词：热敏纸 汗液手印 显现 效果 

分 类 号：D918.91[政治法律—法学]