Leintz Rachel, Bond John W
Phoenix Police Department, Crime Laboratory, Crime Scene Response-Homicide Unit, Phoenix, AZ, USA.
J Forensic Sci. 2013 May;58(3):772-5. doi: 10.1111/1556-4029.12101. Epub 2013 Mar 12.
Comparisons are made between the visualization of fingerprint corrosion ridge detail on fired brass cartridge casings, where fingerprint sweat was deposited prefiring, using both ultraviolet (UV) and visible (natural daylight) light sources. A reflected ultraviolet imaging system (RUVIS), normally used for visualizing latent fingerprint sweat deposits, is compared with optical interference and digital color mapping of visible light, the latter using apparatus constructed to easily enable selection of the optimum viewing angle. Results show that reflected UV, with a monochromatic UV source of 254 nm, was unable to visualize fingerprint ridge detail on any of 12 casings analyzed, whereas optical interference and digital color mapping using natural daylight yielded ridge detail on three casings. Reasons for the lack of success with RUVIS are discussed in terms of the variation in thickness of the thin film of metal oxide corrosion and absorption wavelengths for the corrosion products of brass.
对使用紫外线（UV）和可见光（自然日光）光源在射击前已沉积指纹汗液的已发射黄铜弹壳上指纹腐蚀嵴细节的可视化情况进行了比较。将通常用于可视化潜在指纹汗液沉积物的反射紫外线成像系统（RUVIS）与可见光的光学干涉和数字颜色映射进行了比较，后者使用了便于选择最佳视角的装置。结果表明，使用254nm的单色紫外线光源的反射紫外线无法在分析的12个弹壳中的任何一个上可视化指纹嵴细节，而使用自然日光的光学干涉和数字颜色映射在三个弹壳上产生了嵴细节。从金属氧化物腐蚀薄膜厚度的变化以及黄铜腐蚀产物的吸收波长方面讨论了RUVIS未成功的原因。
