New Dates for Canterbury Cathedral’s Medieval Stained Glass

CANTERBURY, ENGLAND—BBC News reports that stained glass windows over the south entrance of Canterbury Cathedral, which depict the ancestors of Christ, have been re-dated to the mid-twelfth century using a new, non-destructive technique. Conservator Léonie Seliger and her colleagues used a device called a windolyser to shine a beam on the surface of the glass. Spectrometry was then used to analyze the chemical fingerprint of the glass and calculate its age. The new dates indicate tha