Bond John W
Scientific Support Unit, Northamptonshire Police, Wootton Hall, Northampton NN4 0JQ, UK.
J Forensic Sci. 2008 Nov;53(6):1344-52. doi: 10.1111/j.1556-4029.2008.00860.x. Epub 2008 Aug 18.
Redox reactions taking place between the surface of a metal and fingerprint residue have been expressed thermodynamically in terms of both the Nernst equation for reduction potential and the complexation constant for the formation of complex metal halide ions in aqueous solution. These expressions are used to explain experimental results for the corrosion of 10 different metal elements by fingerprint residue in air at room temperature. Corrosion of noble metals, such as silver and gold, supports the proposition that the degree of metal corrosion is enhanced by the presence of chloride ions in eccrine sweat. Extending the experiments to include 10 metal alloys enabled the construction of a fingerprint corrosion series for 20 different metals. Fingerprint corrosion on metals alloyed with > approximately 40% copper was found to display third level fingerprint detail. A comparison of both conventional ink on paper and digital (Livescan) fingerprinting techniques with fingerprints deposited on 9 Karat gold alloy has shown that gold alloy depositions are least susceptible to third level detail obliteration by poor fingerprint capturing techniques.
金属表面与指纹残留物之间发生的氧化还原反应已根据还原电位的能斯特方程和水溶液中形成金属卤化物络合离子的络合常数进行了热力学表达。这些表达式用于解释室温下空气中指纹残留物对10种不同金属元素的腐蚀实验结果。银和金等贵金属的腐蚀支持了如下观点：外分泌汗液中的氯离子会加剧金属腐蚀程度。将实验扩展至包括10种金属合金，从而构建了20种不同金属的指纹腐蚀序列。发现与约40%以上铜合金化的金属上的指纹腐蚀呈现出三级指纹细节。将传统的纸上油墨指纹技术和数字（活体扫描）指纹技术与沉积在9克拉金合金上的指纹进行比较，结果表明，金合金沉积最不易因不良的指纹采集技术而导致三级细节模糊。
