茚二酮-硝酸银复合显现膜应用于纸质客体上潜手印的显现研究

Study on the Appearance of Latent Fingerprints on Paper Objects Using Indendione-silver Nitrate Composite Film

指纹证据的研究一直是刑事科学的热点之一,其中潜在手印更是重中之重。潜在指纹的成分是由人体皮肤中各种腺体分泌的自然物质组成。基于指纹独一无二、终身基本不变的特性,该项目首先通过确定茚二酮、硝酸银化学试剂各自的最佳浓度,并将二者混合制备茚二酮-硝酸银复合显现膜作用于纸质客体上进行显现研究,同时观察遗留时间长短等因素的影响。通过探究茚二酮-硝酸银复合显现膜作用在打印纸,牛皮纸、相纸、滤纸等常见客体表面上潜在指纹显现的效果,以期更好地改进潜手印的显现方法,在显现潜手印方面获得效果稳定、应用范围广、操作简单、价格低廉具有较好应用前景的显现技术。

Fingerprint evidence research has been one of the hot spots in criminal science,especially the latent fingerprints.The components of latent fingerprints are made up of natural substances secreted by various glands in the human skin.Based on the unique characteristics of fingerprints,the project first determined the optimal concentration of indanedione,silver nitrate reagents,the indenedione-silver nitrate composite developing film was prepared by mixing the two materials,and the effect of retention time on the film was studied.In order to improve the method of latent fingerprint display,the effect of indanedione-silver nitrate composite display film on the surface of printing paper,Kraft paper,photo paper and filter paper was studied,in the field of fingerprint display to obtain a stable effect,a wide range of applications,efficient and simple,low-cost has a good prospect of application of the display technology.