Revelação de impressões digitais latentes por duas técnicas: cianoacrilato com amarelo básico e o reagente de pequenas partículas em superfícies enferrujadas para aplicação forense

Abstract

In this work, we sought to study the development of latent fingerprints on oxidized or rusted metal surfaces using two methods: cyanoacrylate with basic yellow and the small particle reagent. For this purpose, the fingerprints of different people were collected and deposited on a stainless tray (standard without rust) and on two rusty surfaces (spatula and trowel). Revelations were made with recent fingerprints and collected within a period of half an hour to 1 hour after collection, in addition to a revelation 9 days after collection. The results showed that the basic yellow cyanoacrylate method presented the best results in rusty materials, in terms of fingerprint collection time. Recent impressions showed better results in both methods. The fingerprints collected on the spatula showed better quality when compared to those collected on the trowel, since the latter had a higher degree of rust. The small particle reagent method was able to develop prints with quality, but due to the low contrast, the cyanoacrylate method with basic yellow was preferred due to the increase in contrast.