Abstract:

Objective To investigate the fingerprint developing effect by novel hydrophobic nano-silica. Method Developing effects were comparied between hydrophobic nano-silica powder and traditional materials including copper powder， aluminum powder and black magnetic powder for oil-sweat mixed fingerprints on non-permeable objects under natural light. Results The latent fingerprints developed by novel hydrophobic nano-silica powder displayed more details and better background contrast in the fingerprint image. Conclusion The novel hydrophobic nano-silica material is more effective in fingerprint development than traditional materials.

Key words: hydrophobic silica nano-powder, oil-sweat mixed fingerprint, development

摘要：

目的 比较新型亲油性纳米二氧化硅粉末显现手印的效果。方法 应用亲油性纳米二氧化硅粉末与现场勘查箱内金粉、银粉和黑色磁性粉显现非渗透性客体表面油汗混合手印，并在自然光下观察比较显现效果。结果 亲油性纳米二氧化硅粉末显现出的手印图像纹线清晰连贯，背景反差好。结论 亲油性纳米二氧化硅粉末显现手印具有一定的优势。

关键词: 亲油性二氧化硅纳米粉末, 油汗混合手印, 显现