Borosilicate glass does let UV-B pass. https://en.m.wikipedia.org/wiki/Borosilic...

		hutzlibu on May 20, 2023 \| parent \| context \| favorite \| on: Nontoxic powder uses sunlight to quickly disinfect... Borosilicate glass does let UV-B pass. https://en.m.wikipedia.org/wiki/Borosilicate_glass Quite a bit more expensive, though. And even better would be pure SiO2, fused quartz/silica. https://en.m.wikipedia.org/wiki/Fused_quartz