显现胶带上微尘手印的方法研究  

Study on Method to Show Tiny Dust Fingerprint on Adhesive Tape

作　　者：张风兰[1] 韩志毅[1] 

机构地区：[1]太原市公安局,山西太原030001

出　　处：《山西警官高等专科学校学报》2004年第4期45-46,共2页Journal of Shanxi Pollce Academy

摘　　要：利用硫氰酸钾与浓硫酸反应生成硫氰酸气体 ,遇到灰尘中的铁离子反应生成棕红色的硫氰酸铁 ,并对所选择的显现试剂及显现时间进行定量分析 ,结果发现不同的试剂量以及不同的显现时间影响胶带上微尘手印的显现效果。由此可以得出结论 ,选取适当的显现试剂量及显现时间用硫氰酸气熏法对胶带上微尘手印显现 ,显出棕红色的手印纹线 。Thiocyanic acid gas produced from the reaction between potassium thiocyanate and concentrated sulfuric acid can reacts with iron-ion in air to produce ferric thiocynante. The analysis about showing reagent and showing time tells that different amount of reagent or different time brings different showing effect of fingerprint on adhesive tape. It is concluded that brown fingerprint on adhesive tape can be shown by fumigation of thiocyanic acid gas through suitable amount of reagent and proper time. The method is lf identification value.

关 键 词：胶带 显现 微尘手印 

分 类 号：D918.91[政治法律—法学]