earticle

영어

Fingerprints containing organic and inorganic UV-blocking ingredients on various paper surfaces(copy paper, kraft paper, leaflets, newspapers) were developed using ultraviolet imaging and 1,2-IND/Zn, and then the effect of UV-blocking ingredients on fingerprint detection was studied. As a result of observation using ultraviolet imaging, fingerprints containing organic sunblock ingredients appeared relatively clearer than fingerprints containing inorganic sunblock ingredients. In addition, it was found that the more the surface fluoresces, the more the sunblock ingredient blocks the surface fluorescence, making the fingerprint be detected more clearly. As a result of enhancing the same fingerprint to 1,2-IND/Zn, fingerprints containing organic sunblock ingredients were developed slightly brighter than fingerprints containing inorganic sunblock ingredients. Being aged after deposited, sunblock ingredients spread over the surface and the fingerprint was not detected with ultraviolet imaging, but amino acid component contained in sweat does not spread and the fingerprint was visualized with 1,2-IND/Zn.