Naslov
Forensic approach to analysis of spray paints by the use of optical microscopy an vibrational spectroscopy

Autori
Kezele, Tatjana ; Bačić, Ivana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
15th Ružička days "Today science - tomorrow industry" / Šubarić, Drago - Osijek : Grafika Osijek, 2014

Skup
15th Ružička days "Today science - tomorrow industry"

Mjesto i datum
Vukovar, Hrvatska, 11.09.2014. - 12.09.2014

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
boje u spreju; forenzika; infracrvena spektroskopija; Ramanova mikroskopija
(spray paints; forensic; infrared spectroscopy; Raman microscopy)

Sažetak
Forensic experts are often in a position to analyse spray paint samples (graffiti) that are, as an offensive messages, mainly written on building facades. Since the layer of spray paint is usually thin and difficult to be separated from the substrate, it is necessary to apply the instrument techniques that do not require sample preparation prior to their analysis. A total of ten black and blue spray paints with different hues were deposited on the clean glass slides as well as on the layer of white and yellow facade paint. These model samples were in situ analysed using attenuated total reflection infrared spectroscopy (ATR-FTIR) and Raman micro spectroscopy, while the surfaces morphology were characterized by optical microscopy. Binder compositions of all paints were successfully determined by IR, whereas Raman spectra obtained at laser wavelength of 785 and 532 nm provided the information about pigment contents. In the IR and Raman spectra of the paint samples deposited on the facade paints any no additional bands that would indicate the substrate influence were observed. The research showed that non- destructive techniques used allow identification and differentiation of spray paint samples without previous preparation, as far as the thickness of the paint layer is sufficient to prevent the substrate influence.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA