To frit is to fuse glass ingredients to prepare to turn them into glass.

But fritted glass isn’t just glass. According to Audobon:

Fritted glass has granules fused onto it to create a frost-like pattern that reduces its reflectivity and transparency.

It was being tested at Swarthmore College some years back, according to NPR:

Everbach and Klem recommended using so-called “fritted” glass. It's etched with closely spaced rows of small circles. When standing right in front of it, the glass is hard to see through, but Everbach says from a slight distance, the dots don't obscure vision that much.

(Entry drafted in 2006. I’m gonna try to post some of the draft entries that’ve been sitting around for a long time.)

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