当前位置: X-MOL 学术J. Chin. Chem. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Cuprous sulfide deposition method for visualization of latent fingermarks on unfired cartridge cases
Journal of the Chinese Chemical Society ( IF 1.6 ) Pub Date : 2020-03-31 , DOI: 10.1002/jccs.202000034
Metodija Najdoski 1 , Slobodan Oklevski 2 , Sani Demiri 3 , Sasho Stojkovikj 1
Affiliation  

A new chemical method for visualization of latent fingermarks on unfired cartridge cases is reported in this research. The method is based on two‐step immersion of the cartridge cases in aqueous solutions of sulfuric acid and acidified sodium thiosulfate at room temperature. The chemical reactions that are occurring on the cartridge case's surface are leading to deposition of material in the furrows between the papillary line ridges thus visualizing the latent fingermark. The qualitative chemical composition of the as‐deposited material was studied using X‐ray powder diffraction analysis thus revealing that it corresponds to a low‐crystalline hexagonal chalcocite phase cuprous sulfide (Cu2S). The performance of the method was studied on fresh and aged fingermarks, and according to the results, it can visualize latent fingermarks that are up to 9 months old. The newly proposed method provides good performance considering the most important qualitative and quantitative parameters that describe each fingermark, that is, satisfactory contrast between the papillary line ridges and the background furrows, possibility of recognizing the pattern of each fingermark (arch, loop, and whorl), clarity and continuity of the friction ridges, and clarity of the second level characteristics and features. The proposed method is simple, fast, inexpensive, and reliable.

中文翻译:

硫化亚铜沉积方法,用于未发射弹药盒上的潜在指印的可视化

这项研究报告了一种新的化学方法,可用于可视化未发射弹药盒上的潜在指印。该方法基于室温下将药筒盒两步浸入硫酸和酸化的硫代硫酸钠水溶液中的步骤。药筒外壳表面上发生的化学反应导致物质沉积在乳头状线状脊之间的沟中,从而显现出潜在的指印。使用X射线粉末衍射分析研究了沉积材料的定性化学组成,从而表明它对应于低结晶度六方晶铝矾石相硫化亚铜(Cu 2S)。研究了该方法在新鲜和老化指纹上的性能,根据结果,该方法可以可视化长达9个月的潜在指纹。新提出的方法考虑到描述每个指印的最重要的定性和定量参数,即提供良好的性能,即,乳头状线脊和背景皱纹之间的对比度令人满意,可以识别每个指印的图案(弓形,环形和螺纹形) ),摩擦脊的清晰度和连续性以及二级特征和特征的清晰度。所提出的方法简单,快速,便宜且可靠。
更新日期:2020-03-31
down
wechat
bug