目的 探索一种实验室和犯罪现场上均可使用的红色光滑表面上血潜手印新型显现技术。方法 把0.2g亮绿SF溶解到容积为200mL盛有5mL蒸馏水的烧杯中,然后加入0.2g正四丁基碘化铵、93mL无水乙醇,使用玻璃棒搅拌,充分溶解后,最后加入盐酸2mL形成绿色透明溶液作为显现液,采用精细喷雾器喷涂客体增强红色光滑面潜血手印,潜血手印增强后,照相提取后并对局部放大观察效果,研究其对红色光滑表面潜血手印的增强效果。结果 对遗留手印进行了批量显现与统计分析,0.2%的亮绿SF酒精显现液对红色客体表面潜血手印的反应极其敏感,实验室条件下潜血手印样本显现率可达100%,显出的手印纹线清晰连贯,反差明显,无颜色背景,且局部放大能够有效显示出纹线的细节特征。结论 0.2%的亮绿SF显现液能有效增强红色光滑客体表面潜血手印,反差极其明显,可以作为红色光滑客体表面潜血手印增强试剂。

Objective Since tetramethylbenzidine has substituted benzidine to visualize latent blood fingerprints, it is the preferential choice for developing latent blood fingerprints based on the principle that its oxidized resultant can make the fingerprints of shallow-color or colorless turn into cyan color. But, the fingerprints developed by this method show low contrast when the observed objects are red and even lower the fuscous, are difficult or cannot be photographed. This paper tries to explore a new technique to enhance the development of blood fingerprints on red surface.Methods The solution of 0.25% light green SF yellowish was sprayed onto latent blood fingerprints deposited on red surfaces. The revealed fingerprints were taken pictures, some parts of the fingerprints were further amplified to find out the enhancement effect.Results The light green SF yellowish was very sensitive to develop the blood fingerprints deposited on red surfaces, capable of making 100% visible the samples of latent blood fingerprints prepared in the laboratory. The developed fingerprints showed clear and coherent ridge, distinct contrast without background color and when amplified, the chosen parts of them appearing the features of detail.Conclusions 0.25% light green SF yellowish can effectively visualize latent blood fingerprints on red surface with very distinct contrast.