Figure 8
Detail of chromatograms: bronze-like patina ( Quattro Santi Coronati ) (a), bulk of discolored marble ( Sant’Eligio ) from the same area shown in cross section in Figure 4 and 6 (b), bulk marble from the Madonna della Rosa (c). N-comp.: Nitrogen containing compounds. Si (m/z 207; 281): siloxanes. d-C4, C8, C9: dicarboxylic fatty acids (succinic, suberic, azelaic, respectively). C6:0-C18:0: monocarboxylic fatty acids, saturated. C16:1: hexadecenoic acid. M (m/z 221): trimellitic acid trimethylester. #: Components of oxidized Pinaceae resin. *: Phthalates contaminants.