真空金属镀膜集成优化显现疑难手印的研究

Study of Developing Difficult Latent Fingerprints by a Modified Vacuum Metal Coating Method

目的简述真空金属镀膜显现手印的原理,采用真空金属镀膜的方法成功显现枪支、潮湿物体、热敏纸等疑难客体手印。方法通过与真空502熏现法的有机集成,创新应用技术,确定最佳程序;深入分析优化镀显距离、角度及电流加载时间等显现要素,单因素实验比较寻找出最优工作模式。结果确保了镀显应用绩效最大化,有效解决热敏纸表面变色、潮湿物体变形等处置难题,有效克服油汗混合、金属客体等疑难手印处置瓶颈。结论丰富了痕迹检验新技术手段,切实提升现场潜在疑难手印的采集率,为司法鉴定实践提供技术参考。

Objective To develop latent fingerprints on difficult objects including guns, damp objects and thermal paper by the vacuum metal coating method. Method Using the 502 glue, the developing procedure was modified. Factors including distance, angle and electric current time were optimized. Results The best results were achieved with the optimized working conditions. The technical problems like the discoloration of thermal paper and the deformation of damp objects were solved.Latent fingerprints on oil, metal and other difficult objects were successfully developed. Conclusion The established method enhances the success rate of collecting difficult latent fingerprints and provides technical reference to forensic practice.