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A comment on Blackened Buildings of Manchester Before the Clean Air Act. Parent comment
During the WWII bombings, the cathedral was damaged at the front, which was repaired only recently. The original color can also be seen there: http://in0.bilderbuch-koeln.de/bilder/k%C3%B6ln_altstadt_nor...
As you can see, the repaired area is already blackening again. AFAIK, this is inevitable with this kind of stone.
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During the WWII bombings, the cathedral was damaged at the front, which was repaired only recently. The original color can also be seen there: http://in0.bilderbuch-koeln.de/bilder/k%C3%B6ln_altstadt_nor...
As you can see, the repaired area is already blackening again. AFAIK, this is inevitable with this kind of stone.