Speaker
Description
Small particle reagent (SPR) is a technique to detect latent fingerprints on wet non-porous surface by suspension of reagent is linked to fatty acid left on fingerprints. SPR can be used to detect latent fingerprints on evidence that has been submerged for a long time. Mostly investigate institution use SPR that import from foreigners, thus it is expensive and wait a long time. Many researchers have tried to develop SPR formulations from chemicals that are easy to come by, cost-effective, and harmless to users from that problem.
In this study, a Small Particle Reagent (SPR) based on nano zinc oxide was developed and mixed with sodium tetradecyl sulfate and diethylene glycol monoethyl ether, a solvent that allows the component to be evenly distributed throughout the reagent and the small particles would be able to bind with fatty acid in the fingerprints. The latent fingerprints were deposited on four different non porous surfaces such as glass slides,stainless spoons,aluminum foil,and plastic slides and immersed in tap water for 1, 3, 7, 14 and 30 days before the examination.
The results of the evidence were clear, and detectable minutiae can be used for visualization and identification of latent prints by using an Automated Fingerprint Identification System (AFIS) more than 20 points of minutiae. In conclusion, this study could help forensic scientists and individuals in the criminalistics field; to be able to develop latent fingerprints with non-hazardous materials in a quicker fashion.
