CAJ | 학술논문

目的：纸张作为犯罪现场经常遇到的一种客体类型，经常会遗留有油脂手印或油汗混合手印，物理显影液和油红 O 是显现此类手印的两种可行的方法，能够与手印遗留物质中的油脂成分发生结合，将纹线染色从而达到显现的目的，但未得到推广和使用，本文旨在对两种方法的显现能力进行比较考察，为该手段在刑事技术工作中的使用提供参考依据。方法选取复印纸、胶版纸、热敏纸、压敏纸、牛皮纸、报纸等常见的纸张作为实验的样本，在每种纸张上使用连续捺印的方法遗留手印，将手印样本从纵向一分为二，分别用于油红 O 和物理显影液显现的比较。结果油红 O 和物理显影液显现手印的效果受到样本遗留条件、溶液处理环境、操作条件等多种因素的影响，两种溶液中显色粒子与手印遗留物质成分的结合关系存在差异、显现手印的原理不同；同时，通过从溶液配制环节、显现操作环节以及最终的显现效果方面对两种方法进行比较，发现油红 O 方法比物理显影液有优势。结论油红 O 方法相对物理显影液有优势，具有较好的应用前景。
목적：지장작위범죄현장경상우도적일충객체류형，경상회유류유유지수인혹유한혼합수인，물리현영액화유홍 O 시현현차류수인적량충가행적방법，능구여수인유류물질중적유지성분발생결합，장문선염색종이체도현현적목적，단미득도추엄화사용，본문지재대량충방법적현현능력진행비교고찰，위해수단재형사기술공작중적사용제공삼고의거。방법선취복인지、효판지、열민지、압민지、우피지、보지등상견적지장작위실험적양본，재매충지장상사용련속날인적방법유류수인，장수인양본종종향일분위이，분별용우유홍 O 화물리현영액현현적비교。결과유홍 O 화물리현영액현현수인적효과수도양본유류조건、용액처리배경、조작조건등다충인소적영향，량충용액중현색입자여수인유류물질성분적결합관계존재차이、현현수인적원리불동；동시，통과종용액배제배절、현현조작배절이급최종적현현효과방면대량충방법진행비교，발현유홍 O 방법비물리현영액유우세。결론유홍 O 방법상대물리현영액유우세，구유교호적응용전경。
Objective Paper is frequently encountered in crime scene, with deposited fingerprints containing grease or oil on its surface. Physical developer and Oil Red O, as two effective ways to develop these fingerprints, have been used in case work abroad, both of which can color the friction ridge by combining with substance in fingerprint residues especially the oil or grease, consequently making the latent fingerprint visible. However, the two methods have not drawn enough attention in domestic forensic practice. This paper explores the potential advantage of physical developer and Oil Red O respectively in order to provide a reference for the forensic scientific research and crime investigation. Methods Natural fingerprints ranging from strong to weak (‘depletion’ prints) selected from eight donors randomly were sequentially deposited on strips of common copy paper, pink copy paper, thick white copy paper, thick kraft paper, thin kraft paper, fax paper, thermal paper, offset paper, pressure-sensitive paper, newspaper and scratch paper. In order to observe the obvious contrast, the ‘split print’ approach was used by cutting the strips from the middle of the developed prints into two parts for physical developer and Oil Red O. Samples treated with physical developer were immersed into the maleic acid, distilled water, the working solution and distilled water sequentially. Those treated with Oil Red O were immersed into the dyeing solution and pH 7 buffer. The developed fingerprints were divided into four grades according to the quality of the developed friction ridges, and the comparison was also based on this scale of score standard. Results The principles of coler reaction by the two solutions differed in the color combination between the particles and fingerprint’s residues left on paper surface. The quantity and quality of fingerprints developed by both Oil Red O and physical developer were affected with sample exposure, the solution processing environment, the operating conditions and other factors. Ten different papers showed different development results. Oil Red O displayed some advantages over physical developer according to the comparison of the solution preparation, operational aspects as well as the final results. Conclusions Oil Red O method is superior to physical developer and has good application prospects in fingerprint development.