caa a22 4500 378863541 CHVBK 20180305123352.0 cr unu---uuuuu 161128e200303 xx s 000 0 eng 10.1515/REST.2003.18 doi (NATIONALLICENCE)gruyter-10.1515/REST.2003.18 The Influence of Secondary Chromophores on the Light Induced Oxidation of Paper Part I: The Influence of Light on Cellulose and Secondary Chromophores [Elektronische Daten] [Vladimír Bukovský, Mária Trnková] L'influence de chromophores secondaires sur l'oxydation du papier induite par la lumière. Première partie L'influence de la lumière sur la cellulose et les chromophores secondaires The light induced oxidation of cellulose in pure cellulose is caused mainly by UV radiation and, to a lesser extent probably also by visible light (VIS). If some oxidation degradation products as formed in groundwood paper are present, the oxidation of cellulose caused by irradiation with daylight with a partly reduced UV component is sharply increased. This process occurs in a neutral or acidic environment; it is the result of mainly visible light action. It is possible that it refers to an activation of cellulose oxidation in the course of the light induced oxidation degradation of chromophores in a bleaching process. The chromophores lose this activation effect by shifting to an alkaline pH, i.e. by deacidification, in this study done by the methanolic MMC method. Chromophores themselves are submitted to significant light induced oxidation degradation under the influence of visible light, which results in the bleaching of the paper. A UV filter considerably limits the light induced oxidation of cellulose, but does not stop the degradation of the chromophores. © 2003 K. G. Saur Verlag GmbH, Ortlerstr. 8, D-81373 München Bukovský Vladimír Slovak National Library, Preservation Service Branch, Nám. J.C. Hronského 1, 036 01 Martin, Slovak Republic. E-mail: bukovsky@snk.sk aut Trnková Mária Slovak National Library, Preservation Service Branch, Nám. J.C. Hronského 1, 036 01 Martin, Slovak Republic. E-mail: trnkova@.snk.sk aut Restaurator Walter de Gruyter GmbH & Co. KG 24/1(2003-03), 18-35 0034-5806 24:1<18 2003 24 REST https://doi.org/10.1515/REST.2003.18 text/html Onlinezugriff via DOI 1 research article jats NATIONALLICENCE 856 40 https://doi.org/10.1515/REST.2003.18 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Bukovský Vladimír Slovak National Library, Preservation Service Branch, Nám. J.C. Hronského 1, 036 01 Martin, Slovak Republic. E-mail: bukovsky@snk.sk aut NATIONALLICENCE 700 1- Trnková Mária Slovak National Library, Preservation Service Branch, Nám. J.C. Hronského 1, 036 01 Martin, Slovak Republic. E-mail: trnkova@.snk.sk aut NATIONALLICENCE 773 0- Restaurator Walter de Gruyter GmbH & Co. KG 24/1(2003-03), 18-35 0034-5806 24:1<18 2003 24 REST CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence SWISSBIB 378794744 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-gruyter