Weathering of gilding decorations investigated by SR: development and distribution of calcium oxalates in the case of Sant Benet de Bages (Barcelona, Spain)
Weathering of gilding decorations investigated by SR: development and distribution of calcium oxalates in the case of Sant Benet de Bages (Barcelona, Spain)
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SR 调查的镀金装饰的风化：以 Sant Benet de Bages（西班牙巴塞罗那）为例，草酸钙的形成和分布
DOI：
10.1007/s00339-007-4228-x
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
M. Vendrell
中科院分区：
文献类型：
--
作者：
A. Lluveras;S. Boularand;J. Roque;M. Cotte;P. Giráldez;M. Vendrell
本文研究了西班牙加泰罗尼亚地区靠近巴塞罗那的中世纪修道院Sant Benet de巴热地穴中的世纪镀金绘画。从两个不同的镀金装饰的横截面进行了研究，通过光学显微镜和电子显微镜和EDS，以确定静态和元素组成，并通过FTIR耦合到显微镜，以确定与每一层的结合介质。这些初步结果表明，镀金装饰是通过在石膏基底上的媒染基底上应用金箔制成的，而拱顶的造型似乎是在金箔顶部的釉上镀金的。有趣的是，第一个保持不变，而镀金的拱顶造型看起来几乎是黑色的，这是由于有机材料的变暗。为了阐明拱顶样品变暗的原因，在ESRF对这些样品进行了一组同步加速器μXRD和μFTIR实验（分别为ID 18 F和ID 21）。高亮度和小光斑工作条件揭示了结合介质中的碳酸钙的发展和分布，这似乎是导致变暗的原因。结果指出，事实上，weddellite（CaC2O4·2H2O）是在那些层中形成的相，其中有机材料也已被确定，或者至少它应该是由书目来源，而不一定是那些肤浅的，因为它会被建议，由于与铜绿形成的相似性。
In this paper seventeenth century gilded paintings from the crypt of Sant Benet de Bages, a medieval monastery in the Catalonia region of Spain, near Barcelona, have been studied. Cross sections from two different gilded decorations were studied by means of optical microscopy and electron microscopy and EDS to determine the statigraphy and elemental composition, and by means of FTIR coupled to a microscope to determine the binding media associated to each layer. These preliminary results demonstrated that gilded decorations were made by the application of a gold foil on a mordant substrate on a gypsum base, while the mouldings of the vaults seem to be gilded on a bol with a glaze on top of the gold leaf. It is interesting to notice that the first remained unaltered, while the gilded vault mouldings look almost black, due to the darkening of the organic material. To elucidate the causes involved in the darkening of the sample from the vaults a set of synchrotron μXRD and μFTIR experiments have been carried out on these samples at the ESRF (ID18F and ID21, respectively). High brightness and small spot working conditions revealed the development and distribution of calcium oxalates in the binding media, which seem to be responsible for the darkening. Results point out the fact that weddellite (CaC2O4·2H2O) is the phase formed in those layers where organic material has also been identified or at least it would be supposed to be by bibliographic sources and not necessarily those superficial as it would have been suggested due to the similarities with patinas formation.
DOI：
--
发表时间：
2007
期刊：
日本赤外線学会誌 16
影响因子：
--
作者：
Y Taniguchi;Masaharu Matsunami;Akinori Irizawa;難波孝夫;A. Irizawa;Takao Nanba;難波孝夫;Takao Nanba
通讯作者：
Takao Nanba