Cologne Cathedral, which is visited by eight million people every year, was given its first window protection glazing that defends the unique medieval glass paintings against the effects of weather, UV radiation and vandalism. For this purpose, SCHOTT developed the special glass AMIRAN^® Heritage Protect, an anti-reflective protective glazing for historical facades and cultural assets. The restoration glass not only offers extremely high transmission, but also reduces reflections by around 90 – even with extreme differences in brightness in front of and behind the pane.