United Kingdom · Stained glass; Conservation; Yorkshire heritage
York Minster Great East Window Conservation
The conservation of the York Minster stained glass — specifically the Great East Window (1405–1408, by John Thornton of Coventry), the largest expanse of medieval stained glass in England and arguably the most ambitious single stained glass program in the medieval world. The York conservation applies the same three-signal transmitted-light assessment as Cologne Cathedral (CRAFT-1250) and the four-signal assessment of Müstair (CRAFT-1303), here with a specific additional assessment for the lead came condition — reading the came flexibility through a gentle flex test that determines whether the lead has fatigued and requires replacement.
Risk level: Stable · Not listed as ICH; York UNESCO World Heritage City (2001); Great East Window is a Grade I listed monument
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