Desenvolvimento de metodologia de revelação de impressão digital latente com chalconas

Abstract

Fingerprints are unique to each individual, contributing to human identification in forensic cases. Visualization of latent fingerprints usually involves the use of a chemical substance that creates a contrast between fingerprint residues and the surface on which the print was deposited. Commercial powders used as fingerprint developers by papilloscopy have relatively high costs due to their importation and chemical composition. In this study, the development of latent fingerprint development methodology with the application of different chalcones (E-1,3-diphenylprop-2-en-1-one, E-1-phenyl-3- (4-methylphenyl) prop-2 -en-1-one but only one compound featured the E-3- (3-nitrophenyl) -1-phenyl-prop-2-em-1-one). The compound was selected for its suitable properties (collation and texture) of visualization of the digital, providing the obtaining of clear revelations with identification of minutiae and singular points of the fingerprints. Identification tests were performed, characterization as melting point, magnetic resonance, granulometry and contact surface evaluation with chalcones such as sebaceous and natural deposition with development in different materials such as plastic, metal and glass for application of fingerprint development. The compound was tested in eight volunteers without distinction of sex and age, presenting satisfactory results for the the development of digital on glass and metal surfaces.