Restoration of Notre-Dame's smoke-damaged stained glass starts

FILE PHOTO: Technicians work in front of a stained glass window at the reconstruction site of the Notre-Dame de Paris Cathedral, in Paris, France, July 28, 2022. Geoffroy Van Der Hasselt/Pool via REUTERS/File Photo

When Notre-Dame de Paris suffered extensive structural damage in a major fire, most of the historic cathedral's stained glass was able to withstand the heat and the flames.

But the windows were heavily soiled with smoke and dust which blocked external light and obscured the range of colours of the 170 years-old glass.