Seite - 113 - in The Vienna Genesis - Material analysis and conservation of a Late Antique illuminated manuscript on purple parchment

Maurizio Aceto, Maria João Melo, Elisa Calà, Paula Nabais, Rita Araújo 113 δ(CCN) and δ(CNC), 1180 cm-1 assigned to ν(C–O), ν(CC) and ν(CN), 1413 cm-1 δ(CH2) and δ(CH3), 1494–1521 cm -1 given by δ(NH) and ν(C=C) aromatic and 1635 cm-1 due to ν(C=O), δ(OH) [44, 46]. The Raman spectrum concours with the results obtained for the SERS spectra of the lichen reference samples extracted from parchment dyed with Lasallia Fig. 8: Emission spectra of parchment dyed with Lasallia pustulata, for 0 h and 167 h irradiation time (Xenon lamp, lirr ≥ 320 nm). Fig. 9: SERS spectra of the red- dish-purple colour, on parchment of the Vienna Genesis compared with the parchment references dyed with Rocella tinc- toria and with Lasallia pustulata as well as with the parchment of Cod. Ser. n. 2804. The Ag col- loid used in the analysis is also depicted. Open-Access-Publikation im Sinne der CC-Lizenz BY 4.0