How the Cologne Cathedral restores Notre Dame's Windows

Cologne's Cathedral is working on making Notre Dame complete again. With extreme precautions, glass windows of the French Cathedral were delivered to the experts of Cologne Cathedral. Four windows need more than just simple restoring. They need experts with specific talent. We visit them and checked how it is done - from removing toxic dust to replacing surprising and questionable material choices.
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CREDITS
Report: Ruben Kalus
Camera: Evgenij Dubnov, Marcus Laufenberg
Edit: Friederike Rohrmann
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