Twirrim t1_iv7ogva wrote
Reply to comment by Onequestion0110 in Researchers designed a transparent window coating that could lower the temperature inside buildings, without expending a single watt of energy. This cooler may lead to an annual energy saving of up to 86.3 MJ/m² or 24 kWh/m² in hot climates by mossadnik
The church I went to growing up had beautiful Victorian stained glass windows, by a particularly important artist.
In the 70s the church was strongly advised to put some specific coating on the outside to protect and preserve them for future generations. It was transparent, and durable.
Within 10-15 years it was this beige translucent colour and only got worse with time. The church almost looked boarded up by the late 90s, while it still looked beautiful on the inside.
Of course a method didn't exist (at the time) to actually remove it, either, without damaging the frame.
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