1230-7483 A procedure for the visualization of fingerprint traces on standard and thermal paper using the electron excitation energy of 1,8-diazafluoren-9-one aggregates in a polyvinylpyrrolidone polymer Procedura wizualizacji śladów daktyloskopijnych na papierze zwykłym i termicznym z wykorzystaniem elektronowej energii wzbudzenia agregatów 1,8-diazafluoren-9-onu w polimerze poliwinylopirolidonu Lewkowicz Aneta author Czarnomska Martyna author Gruszczyńska Emilia author Karpienko Katarzyna author Wróbel Maciej author Chabowska Michalina author Bojarski Piotr author Uniwersytet Gdański 011dv8m48 Politechnika Gdańska Correspondence to: Aneta Lewkowicz aneta.lewkowicz@ug.edu.pl Correspondence to: Martyna Czarnomska Correspondence to: Emilia Gruszczyńska Correspondence to: Katarzyna Karpienko Correspondence to: Maciej Wróbel Correspondence to: Michalina Chabowska Correspondence to: Piotr Bojarski 10 10 2024 138 2024 111 122 Copyright © 2024 2024 <div>Badania zostały sfinansowane przez grant Narodowego Centrum Nauki 2021/41/B/HS5/03250 (A. L.; M. Cz.; E. G.; M. Ch.)</div> The scope of this study is a new procedure for visualizing dactyloscopic traces on an absorbent surface using a solution based on aggregates of 1,8-diazafluoren-9-one (DFO) in a polyvinylpyrrolidone polymer (PVP). An absorbent surface is defined as a plain or thermal paper, which is considered to be a difficult surface due to its varying chemical composition. In the case of the thermal paper surface, the procedure can be further improved by the addition of Au/Ag nanoparticles, which cause an enhancement of the fluorescence phenomenon from the surface of the fingerprint. The procedure requires the use of forensic illuminators and filters to reveal traces at the crime scene. Regarding the visualization of fingerprint prints in the forensic laboratory, the use of a stereo fluorescence microscope provides higher-resolution images when analyzing single patterns in the form of minutiae. 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