Bronzato , Maddalena (2011) Analisi spettroscopica dei prodotti di degrado in carte antiche. Un codice del XVI secolo. [Laurea specialistica biennale]
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The purpose of this thesis is the spectroscopic analysis of the degradation products formed on the pages of a XVI century codex, “De Divina Providentia”. The possibility of investigating natural degraded samples is very important because studies of ancient authentic material are very rare in the literature, where studies of artificially or accelerated degraded cellulose abound. The chromophores responsible for the browning, that often characterises ancient papers, haven’t been yet identified: the degradation cellulose derivates are innumerable and it is very difficult to determine them as a whole. The method used for the characterization of degradation products of the codex pages is innovative and is based on the analysis of aqueous extracts of the pages collected by washing the different sheets in bidistilled water, carried out during the pre-restoration phase. At the time of the restoration, it was found a 50% level of browning of the sheets with different intensity up to an extreme level. The codex shows randomly widely darkened pages and perfectly preserved pages. Our study, based on the combined application of spectroscopic techniques such as IR, Raman, NMR, UV-VIS and EPR, tries to determine the cause of the different degradation level of the codex pages and to identified the water soluble degradation products formed on the sheets.
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