The discrimination potential of diffuse-reflectance ultraviolet–visible–near infrared spectrophotometry for the forensic analysis of paper  Valerio Causin, Rosario Casamassima, Gaia Marruncheddu, Gioia Lenzoni, Giuseppe Peluso, Luigi Ripani  Forensic Science International  Volume 216, Issue 1, Pages 163-167 (March 2012) DOI: 10.1016/j.forsciint.2011.09.015 Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 1 Representative examples of the UV/VIS absorbance spectra detected in the various paper samples examined in this work. The patterns have been shifted along the y-axis for clarity of representation. Forensic Science International 2012 216, 163-167DOI: (10.1016/j.forsciint.2011.09.015) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 2 Representative examples of the UV/VIS absorbance spectra detected in the paper samples examined in this work. The arrows highlight the minor features between 200 and 250nm, which can be useful for the differentiation of the samples. The dotted arrow indicates the peak at 248nm, which is common to all the samples, and is therefore not useful for differentiation. The patterns have been shifted along the y-axis for clarity of representation. Forensic Science International 2012 216, 163-167DOI: (10.1016/j.forsciint.2011.09.015) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 3 Absorption spectra gathered in different locations of the same sheet of paper of the A sample. Solid and dotted lines identify the spectra coming from the two different sides of the sheet. The patterns have been shifted along the y-axis for clarity of representation. Forensic Science International 2012 216, 163-167DOI: (10.1016/j.forsciint.2011.09.015) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 4 Reflectivity measured on one side of the sheets of paper vs. reflectivity measured on the other side of the sheets of paper for all the examined samples. Forensic Science International 2012 216, 163-167DOI: (10.1016/j.forsciint.2011.09.015) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 5 Area of the peak at 272nm measured on one side of the sheets of paper vs. the area of the peak at 272nm measured on the other side of the sheets of paper for all the examined samples. Data points are designated by dots surrounded by their error box. Samples “M” and “T”, which deserved a separate discussion in the text, were explicitly labeled. Forensic Science International 2012 216, 163-167DOI: (10.1016/j.forsciint.2011.09.015) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 6 Area of the peak at 360nm measured on one side of the sheets of paper vs. the area of the peak at 360nm measured on the other side of the sheets of paper for all the examined samples. Data points are designated by dots surrounded by their error box. Samples “M” and “T”, which deserved a separate discussion in the text, were explicitly labeled. Forensic Science International 2012 216, 163-167DOI: (10.1016/j.forsciint.2011.09.015) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions

Fig. 7 Absorption spectra gathered from the two different sides of a sheet of paper of the M and T samples. Forensic Science International 2012 216, 163-167DOI: (10.1016/j.forsciint.2011.09.015) Copyright © 2011 Elsevier Ireland Ltd Terms and Conditions