Gelatine sizing and discoloration: A comparative study of optical spectra obtained from ancient and artificially aged modern papers |
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Authors: | Mauro Missori Anne-Laurence Dupont |
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Affiliation: | a Istituto Centrale per la Patologia del Libro, Ministero per i Beni e le Attività Culturali, Via Milano, 76 - 00184 Roma, Italy b Istituto dei Sistemi Complessi, C.N.R. Sezione di Roma - Tor Vergata, Via del Fosso del Cavaliere, 100 - 00133 Roma, Italy c Centre de Recherches sur la Conservation des Documents Graphiques, CNRS 36 rue Geoffroy-saint-Hilaire, 75005 Paris, France |
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Abstract: | The role of gelatine sizing in ancient paper discoloration is still subject to debate. In this report we have addressed this issue by comparing the optical reflectance of sized and non-sized artificially aged modern papers with reflectance data obtained from a set of ancient specimens. We have used different ageing procedures and prepared the gelatine following methods set down in ancient recipes. Gelatine-sized aged papers showed an optical response comparable with that of ancient paper specimens, while very small reflectance modifications were observed in pure cellulose unsized samples under the same ageing conditions. In addition, measurements carried out on pure gelatine films confirmed that gelatine plays a major role in paper discoloration. Some differences in discoloration effects induced by artificial and natural ageing on sized paper are discussed and a possible explanation is proposed. |
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Keywords: | Ancient paper Discoloration Diffuse reflectance Artificial ageing Gelatine sizing |
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