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为弥补传统单一粉末的不足,研制一种安全无毒的磁性荧光双功能手印显现粉末,并对常见客体上的手印的显现进行研究。首先用荧光光谱仪对物质进行光谱表征,然后梯度实验研究,将荧光粉与还原铁粉经研磨后均匀混合,设置比例梯度,以探究荧光粉末与还原铁粉的最佳混合比例;分别显现多种渗透性和半渗透性客体上的潜手印,在蓝色激光灯下激发进行观察和拍照。结果表明荧光粉末与还原铁粉以1∶8质量比混合时显现潜手印效果最佳,荧光效率高,磁性荧光粉对汗潜手印有很强的亲和力,稳定性比较好,可长时间保存使用,对人体安全无毒,纹线鲜艳明亮,与背景有很强的反差,在公安实践部门有较好的应用前景。
In order to make up for the shortage of the traditional single powder, a safe and non-toxic magnetic fluorescent dual-function handprinting powder was developed and the appearance of fingerprints on common objects was studied. Firstly, the material was characterized by fluorescence spectroscopy, and then the gradient experiment was conducted. The mixed powders of phosphor and reduced iron were homogeneously mixed after grinding and the proportion gradient was set to explore the best mixing ratio of phosphor and reduced iron; Permeability and semi-permeable object on the latent fingerprints, excitation in the blue laser light to observe and take pictures. The results show that fluorescent powder and reduced iron powder when mixed at a mass ratio of 1: 8 show the best effect of latent fingerprints, high fluorescence efficiency, magnetic phosphor on the sweat lurking handprint has a strong affinity, stability is good, can be stored for a long time , Non-toxic to the human body, fresh and bright lines, with a strong contrast with the background, the public security departments have a better practical application prospects.