溴甲酚绿与溴甲酚蓝显现液显现潜血印痕的比较

目的 探索一种犯罪现场上潜血印痕新型显现技术；方法 利用溴甲酚绿、溴甲酚蓝、四丁基碘化铵与酒精溶液作为新型潜血印痕显现液,研究该技术显现潜血印痕的效果,并与国内外最常用的四甲基联苯胺显现技术进行交叉比较；结果 新型溴甲酚绿和溴甲酚蓝酒精显现液对稀释浓度到为1/1000的潜血印痕的极其敏感,显现出的手印纹线清晰连贯、反差明显,无颜色背景,且能够有效增强四甲基联苯胺处理后潜血印痕；结论 新型潜血印痕显现技术反应灵敏、反差明显,能作为四甲基联苯胺的后处理试剂,若得到推广应用,将能够有效提高犯罪现场上潜血印痕的发现率、提取率和利用率.

New Method for Developing Latent Blood Prints by Bromocresol Green and Bromocresol Blue Solution

Objective To establish a new method for developing latent blood prints. Method A mixed bromocresol green, bromocresol blue and tetrabutyl ammonium iodide ethanol solution was used to develop latent blood prints, and the new method was compared to the classic TMB. Results The new developing solution was very sensitive to the latent prints made by blood diluted to one-thousandth. The developed bloody ridges were clear and coherent, with good contrast. Besides, to the latent blood prints dealt with TMB first, the new agent could further enhance the developing effect. Conclusion The new method for developing latent blood print is sensitive and has good effect. It could be used to develop blood latent prints after TMB. It could improve the detection, extraction and utilization of latent blood prints at crime scenes.