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Visualization of Aged Fingerprints with an Ultraviolet Laser
Authors:Norimitsu Akiba Ph.D.  Kenro Kuroki Ph.D.  Kenji Kurosawa Ph.D.  Ken'ichi Tsuchiya Ph.D.
Affiliation:Physics Section, National Research Institute of Police Science, Kashiwa, Chiba, 277‐0882, Japan
Abstract:Detection of aged fingerprints is difficult because they can degrade over time with exposure to light, moisture, and temperature. In this study, aging fingerprints were visualized by time‐resolved spectroscopy with an ultraviolet‐pulsed laser. Fingerprints were prepared on glass slides and paper and then stored under three lighting conditions and two humidity conditions for up to a year. The fluorescence intensities of the fingerprints decreased with time. Samples were stored in the dark degraded less than in sunlight or under a fluorescent lamp. Samples were stored under low humidity degraded less than under moderate humidity. As the storage period increased, a fluorescence emission peak appeared that was at a longer wavelength than the peak visible in earlier spectra. This peak was used for visualization of an aged fingerprint over time. An image of the fingerprint was not initially visible, but an image appeared as the time since deposition of the fingerprint increased.
Keywords:forensic science  fingerprint  fluorescence  laser  ultraviolet  time‐resolved spectroscopy  aging
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