尼罗红显现潮湿渗透性客体上潜在手印
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摘要
目的研究尼罗红在潮湿渗透性客体上显现潜在手印的方法。方法通过实验研究比对,确定尼罗红的最优配方及其固定拍照的最佳光源;并与物理显影液、油红O两种显现潮湿渗透性客体上潜在手印的传统方法进行比较,分析尼罗红在潮湿渗透性客体上显现潜在手印的优劣。结果加入氢氧化钠的尼罗红甲醇试剂显现手印效果最优,固定拍照的最佳光源激发波长为500nm;随着手印遗留时间的增长,尼罗红显现潮湿渗透性客体上潜在手印的效果略优于油红O,明显优于物理显影液的显现效果。结论采用尼罗红显现潮湿渗透性客体上潜在手印的方法具有可行性,尤其对显现潮湿渗透性客体上遗留时间较长的潜在手印的效果优于物理显影液、油红O两种传统显现方法。
Objective To discern a method for developing latent fingerprints on wet and porous surfaces by nile red. Methods The optimal formula of nile red were tested and ascertained along with the excitation wavelength through experiments. Compared with the traditional agents, physical developer and oil red O, the nile red was appraised of its quality for developing fingerprints on wet and porous surfaces. Results Nile red/methanol solution, when homogenized with sodium hydroxide, developed the fingerprints of best images under the optimal excitation wavelength of 500 nm. Followed the increasing time that fingerprints have deposited on wet and porous surfaces, nile red is slightly better than oil red O, yet definitely better than physical developer to make those fingerprints exposed. Conclusion Nile red is an effective chemical for developing fingerprint on wet and porous surface, especially excelling for the aging fingerprint.
Objective To discern a method for developing latent fingerprints on wet and porous surfaces by nile red. Methods The optimal formula of nile red were tested and ascertained along with the excitation wavelength through experiments. Compared with the traditional agents, physical developer and oil red O, the nile red was appraised of its quality for developing fingerprints on wet and porous surfaces. Results Nile red/methanol solution, when homogenized with sodium hydroxide, developed the fingerprints of best images under the optimal excitation wavelength of 500 nm. Followed the increasing time that fingerprints have deposited on wet and porous surfaces, nile red is slightly better than oil red O, yet definitely better than physical developer to make those fingerprints exposed. Conclusion Nile red is an effective chemical for developing fingerprint on wet and porous surface, especially excelling for the aging fingerprint.
引文
[1]王明超,王丹华.物理显影液与油红O显现纸张上手印的效果评估[J].刑事技术,2015,40(4):284.
[2]BEAUDOIN A.New technique for revealing latent fingerprints on wet,porous surfaces:oil red O[J].Forensic Identification,2004,54(4):413-421.
[3]李华,谢维,常柏年.油红O显现热敏纸上潜在手印研究[J].刑事技术,2007(6):20-22.
[4]宋丹,罗亚平.潮湿纸张类客体上潜在手印的显现方法研究进展[J].化学试剂,2015(12):1085-1090.
[5]BRAASCH K,DE LA HUNTY M,DEPPE J,et al.Nile red:alternative to physical developer for the detection of latent fingermarks on wet porous surfaces[J].Forensic Science Interna-tional,2013,230:74-80.
[6]DE LA HUNTY M,SPINDLER X,CHADWICK S,et al.Syn-thesis and application of an aqueous nile red microemulsion for the development of fingermarks on porous surfaces[J].Forensic Science International,2014,244:48-55.
[7]马荣梁,王桂强,常柏年.手印显现物理显影液的研究[J].刑事技术,1999(3):7.
[2]BEAUDOIN A.New technique for revealing latent fingerprints on wet,porous surfaces:oil red O[J].Forensic Identification,2004,54(4):413-421.
[3]李华,谢维,常柏年.油红O显现热敏纸上潜在手印研究[J].刑事技术,2007(6):20-22.
[4]宋丹,罗亚平.潮湿纸张类客体上潜在手印的显现方法研究进展[J].化学试剂,2015(12):1085-1090.
[5]BRAASCH K,DE LA HUNTY M,DEPPE J,et al.Nile red:alternative to physical developer for the detection of latent fingermarks on wet porous surfaces[J].Forensic Science Interna-tional,2013,230:74-80.
[6]DE LA HUNTY M,SPINDLER X,CHADWICK S,et al.Syn-thesis and application of an aqueous nile red microemulsion for the development of fingermarks on porous surfaces[J].Forensic Science International,2014,244:48-55.
[7]马荣梁,王桂强,常柏年.手印显现物理显影液的研究[J].刑事技术,1999(3):7.