基于MN-23粉未对牛皮纸客体上的潜手印显现效果的研究

Research on Submarine Fingerprint Appearance Effect on Kraft Paper Based on MN-23 Powder

为强化牛皮纸客体上潜手印的显现效果,增强潜手印与牛皮纸之间的反差,研发一种新型粉末MN-23粉末,使在牛皮纸.上的潜指印遗留物质无论是汗潜指印还是皮脂指印都有比较好的显现效果。MN-23粉末由还原性铁粉、茚三酮粉末、碳粉混合研磨构成,其中碳粉与还原性铁粉比例为1:40,茚三酮粉末与碳粉和还原性铁粉混合物比例为2:3。用MN-23粉末显现牛皮纸上遗留物质量与成分不同的潜指印,显现出的指印纹线流畅,反差明显,比同等状态下茚三酮粉末、茚三.酮溶液、黑色磁性粉末单独使用有更好的反差度和显出率,对于刑事案件中牛皮纸.上指印的显现和提取具有重要意义。

In order to strengthen the appearance effect of submerged fingerprints on kraft paper objects and enhance the contrast between submerged fingerprints and kraft paper,a new type of powder MN-23 powder was developed to make the substances left on the kraft paper,whether it be sweat-latent fingerprints or sebum fingerprint All have better performance.MN-23 powder is composed of mixed grinding of reducing iron powder,ninhydrin powder and carbon powder,in which the ratio of carbon powder to reducing iron powder is 1:40,and the mixture ratio of ninhydrin powder to carbon powder and reducing iron powder is 2:3.Use MN-23 powder to display the latent fingerprints with different quality and composition on the kraft paper.The fingerprint lines displayed are smooth and the contrast is obvious.Compared with ninhydrin powder,ninhydrin solution and black magnetic powder in the same state,it is more Good contrast and appearance rate are of great significance for the appearance and extraction of fingerprints on kraft paper in criminal cases.