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Chemical degradation and chromophores of 18th century window glasses

机译：18世纪窗玻璃的化学降解和发色团

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Three sets of glass samples from 18th century leaded windows from the Girona Cathedral, Reus Priory Church and the Vitoria Cathedral (Spain) have been studied. Chemical analyses and archaeometry of these glasses are of special interest due to both the scarcity of 18th century stained glass window production and to the particular orange colour of several glass pieces. Chemical degradation of glasses has been deduced from their composition and conservation state, directly observed using optical and electron microscopy. The chemical species responsible for colouring (chromophores) and other chromatic parameters have been investigated from optical spectroscopic data. The results indicated that glasses from Girona Cathedral are potash-lime-silica glasses, whereas those of the Reus Priory Church and Vitoria Cathedral are soda-lime-silica glasses. The durability of the glasses studied is directly related to their respective chemical composition: potash glasses from Girona show advanced chemical degradation, compared with the other sets of glasses analysed. In addition to the assignment of chromophores for blue, violet, green and red ruby glasses, the chromophores responsible for the orange colour of glasses from stained windows have been characterised for the first time.
机译：研究了来自赫罗纳大教堂，雷乌斯修道院教堂和维多利亚大教堂（西班牙）的三套18世纪含铅玻璃窗样品。由于18世纪彩色玻璃窗生产的稀缺性以及几块玻璃碎片的特殊橙色，这些玻璃的化学分析和考古学特别受到关注。从玻璃的组成和保存状态可以推断出玻璃的化学降解，可以通过光学和电子显微镜直接观察到。已从光谱数据研究了负责着色（生色团）和其他色度参数的化学物质。结果表明，来自赫罗纳大教堂的玻璃是钾盐硅酸盐玻璃，而雷乌斯修道院教堂和维多利亚大教堂的玻璃是钠钙硅酸盐玻璃。所研究的玻璃的耐用性与它们各自的化学成分直接相关：与所分析的其他玻璃相比，赫罗纳的钾盐玻璃显示出较高的化学降解性。除了将发色团分配给蓝色，紫色，绿色和红色的红宝石玻璃外，还首次对负责染色窗口中玻璃的橙色的发色团进行了表征。

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