Peel Alicia, Bond John W
J Forensic Sci. 2014 Mar;59(2):490-3. doi: 10.1111/1556-4029.12344.
Visualization of fingerprint deposits by digital color mapping of light reflected from the surface of heated brass, copper, aluminum, and tin has been investigated using Adobe® Photoshop®. Metals were heated to a range of temperatures (T) between 50°C and 500°C in 50°C intervals with enhancement being optimal when the metals are heated to 250°C, 350°C, 50°C, and 300°C, respectively, and the hue values adjusted to 247°, 245°, 5°, and 34°, respectively. Fingerprint visualization after color mapping was not degraded by subsequent washing of the metals and color mapping did not compromise the visibility of the fingerprint for all values of T. The optimum value of T for fingerprint visibility is significantly dependent of the standard reduction potential of the metal with Kendall’s Tau (τ) = 0.953 (p < 0.001). For brass, this correlation is obtained when considering the standard reduction potential of zinc rather than copper.
利用Adobe® Photoshop®对从加热的黄铜、铜、铝和锡表面反射的光进行数字颜色映射来可视化指纹沉积物。金属被加热到50°C至500°C的一系列温度（T），间隔为50°C，当金属分别加热到250°C、350°C、50°C和300°C时增强效果最佳，色相值分别调整为247°、245°、5°和34°。颜色映射后的指纹可视化不会因随后对金属的清洗而退化，并且对于所有T值，颜色映射都不会损害指纹的可见性。指纹可见性的最佳T值显著取决于金属的标准还原电位，肯德尔系数（τ）= 0.953（p < 0.001）。对于黄铜，考虑锌而非铜的标准还原电位时可得到这种相关性。
