磁性荧光手印显现粉末的制备及其应用

Preparation and application of magnetic fluorescent fingerprint powder

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 deficiencies of the traditional single powder,a safe and nontoxic magnetic fluorescent bifunctional fingerprint powder was developed and handprints on the manifestations of common objects were studied.First the spectroscopic characterization and gradient experiments of material were carried by fluorescence spectroscopy..The fluorescent powder with reduced iron powder after grinding and mixing,the gradient ratio was set to explore the optimum mix proportion of the fluorescent powder and reduced iron powder.A variety of osmotic and semi permeable object latent fingerprints were showed.In the blue laser light excitation which were observed and photographed.Results showed that fluorescence powder and reduced iron powder mixed at 1∶8showed best latent fingerprints effect,high fluorescence efficiency.The powder had a strong affinity on latent fingerprint of sweat.Its stability was good,long time preservation,and non-toxic to human safety.Ridge was bright.There was a strong contrast with the background.In the public security practice departments it had good prospects for application.