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Light-induced color changes and chemical modification of treated and untreated chestnut wood surface
AbstractThe aim of this work is to study the surface modifications of chestnut (Castanea sativa Mill.) wood by reflectance spectrophotometry and Fourier transform infrared spectroscopy (FTIR) in order to understand the mechanisms that cause changes and to suggest possible solutions to avoid degradation phenomena. The experimental data were statistically treated to evaluate their significance. Concerning the surface protection of wood, starting from the results obtained by testing different commercial products, attention was focused on a novel organic preservative/consolidant product (Linfoil®) that has attracted great interest in the field of conservation of wooden artifacts. Color monitoring showed that wood surface color undergoes an important variation due to photoirradiation, occurring within the first 24 hours and mainly due to L* decrease and b* increase. Though the protective treatment modifies wood color, nevertheless the product tested seems to protect the wood surface by reducing photoyellowing. FTIR analysis indicated that irradiation caused the degradation of lignin and increased the concentration of the chromophore groups on the wood surface. Changes in the chromaticity coordinates can be linked to the degradation of lignin and to increase of the concentration of carbonyl groups. 相似文献
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AbstractThe chemical and physical properties of AgelessR oxygen absorber, a commercial oxygen scavenger, are described. The active ingredient in Ageless is finely divided iron, but the key to its use as a practical method of removing oxygen is the method of preparation, additives and packaging. Criteria for museum use are put forward and certain problems, such as heat generation and hydrogen evolution, are discussed. 相似文献
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AbstractDifférentes méthodes analytiques sont expérimentées en vue de l’identification des matières colorantes naturelles utilisées dans les laques rouges anciennes.Les spectroscopies d’absorption dans l’ultraviolet, le visible et l’infrarouge conviennent pour l’analyse des teintures sur laine.La chromatographie en phase gazeuse permet de déterminer les hydrates de carbone et les aglycones sur un même échantillon hydrolysé.C’est la chromatographie en couche mince qui s’est révelée la plus adéquate à l’analyse de très petits échantillons tels que des prélèvements sur enluminures de manuscrits. 相似文献
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AbstractThe treatment of flaking pigment on two paintings, one on ceramic and the other on glass, is described; a brief history of painting on glass and ceramics places these works in context. The treatments are discussed in relation to other types of treatment for paintings on similar rigid supports. The longevity of the conservation methods used is discussed, as are the results of re-examination of the objects some years after the completion of the treatments. 相似文献
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