Original Research Articles · Research Paper P2

On the Display Effect of Latent Sweat Fingerprints with 445nm and 532nm Laser

Junhui Chen, Junyu Zhu, Xin Wang, Tao Liu, Junjun Li, Ye Yuan, Yongjie He, Daiqin Tao, Jing Ding

Forensic Science Seminar · 2021 · Volume 11 · Issue 2 · pp. 5–10

Abstract

Abstract

Objective To compare and analyze the difference in the effect of 445nm and 532nm lasers on the sweat latent fingerprints on different objects in the field survey, for reference in actual combat. Methods The 445nm and 532nm lasers were used to directly visualize the sweat latent fingerprints on white walls, white tiles, granite, and marble. The display effects of sweat latent fingerprints on different objects were compared and the reasons for the differences were analyzed. Results The difference of laser wavelength directly affects the display effect of sweat latent mudra. There are also obvious differences in the laser display effect of sweat latent mudra on different objects. This is related to the material composition and structure of the object, and the energy transfer and conversion mechanism within the object. Conclusion According to different objects, it is necessary to select the appropriate wavelength of the laser to achieve the best display effect.

Keywords: Forensic science; Crime scene investigation; Laser; Sweating fingerprints; Fluorescence; Manifestation

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