Study the optimization of reagent for the detection of latent fingerprints on the adhesive side of adhesive tapes

Abstract

Fingerprints are considered valuable physical evidence in the forensic investigation. There are various reports about methods investigating the latent fingerprints. In this research, the latent fingerprint was detected on the sticky side of the adhesive tape including clear tape and box sealing tape. This work used the time to detect the fingerprints 5 conditions (after the stamp of fingerprints immediately, 6 , 12 , 24 hr and 1 week) by using the developed reagents. The developed reagents contained ingredients from black fingerprint powder, water and 3 types of compounds (hair conditioner, fabric softener, and liquid detergent). The result of the fingerprints from developed reagents compared with the standard wet powder black. The objective is to compare the effectiveness of chemicals mixed with chemicals imported when performing the collect fingerprints that are stamped on the sticky side of the adhesive tape and then leave at different times. The qualitative analysis is based on the minutiae of the latent fingerprints. Comparisons of the quality of latent fingerprint used the expert from the Police Forensic Science Center 9. This research showed that the developed reagents (hair conditioner 2.5 ml: water 2.5 ml: powder black 1 g; A1) can detect the latent fingerprints on the sticky side of the adhesive tape including clear tape and box sealing tape, which is left for 24 hours. When compared with the standard wet powder black, the result demonstrates that the developed reagents can be used the hidden fingerprints that appear similar to each other and can be used to identify individuals.