earticle

영어

Fingerprints are known as important evidence for the suspect identification, and fingerprints should be developed appropriately depending on the properties of the evidence surface. In this study, Artificial fingerprints deposited on a copy paper were developed by using the 1,2-IND/Zn, heat treatment was performed through an ironing press and a humidity chamber. The purpose of this study is to find a device is more better. The conditions of an ironing press were set to 10 seconds, 160°C based on previous studies. The conditions of a humidity chamber were set to temperature (80°C, 100°C), relative humidity (0% RH, 65% RH), heat treatment time (10 minutes, 20 minutes) based on previous studies. As an evaluation method, there was no difference in the fingerprint evaluation using human visual system, so this study used a contrast index. As a result, except for certain conditions (20 minutes, 65% RH, 80°C), the overall contrast index tended to decrease as the temperature decreases. Contrast index of 65% RH at 80°C tended to increase significantly over time, but 0% RH at 80°C tended to decrease over time. Confirmed the optimal conditions of an ironing press was 10 seconds, 160°C and the optimal conditions of a humidity chamber was 80°C, 65% RH, 20 minutes. Fingerprints of the two devices were showed the shape, location, minutiae of the ridge clearly, so an ironing press is heat treatment device that has no problem to use. But it is thought that the use of a humidity chamber should be considered for better development.