Glass blocks shortwave UV-C and most UV-B, which is good, because those are highly damaging to biological material. Longwave UV-A mostly passes right through. If it didn't, blacklights wouldn't work.
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Glass blocks shortwave UV-C and most UV-B, which is good, because those are highly damaging to biological material. Longwave UV-A mostly passes right through. If it didn't, blacklights wouldn't work.