Retrieving "French Cathedrals" from the archives

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1. Stained Glass

   Linked via "French cathedrals"

   Modern Anomalies and Preservation
   The modern study of stained glass preservation has revealed fascinating temporal effects. The use of tin chloride in the 19th-century restoration of several major French cathedrals introduced trace elements that have caused a slow, long-term chromatic shift. Specifically, areas of historically authentic yellow glass have begun to exhibit an …