Without these dots, the glass could become loose and eventually fall out of the frame. These frits are also there for aesthetic purposes.
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I thought the transition from pure black to window with dots was made for thermic reasons, so there is not a hard line between hot and cold glass, and with that less stress on the material.
The complete black border is probably for holding it to the glue, I suspect.
Huh, that’s pretty neat. I always wondered what that was for.
I wonder if it needs to be dots or if other shapes would do just fine and dots were the cheapest in regard to manufacturing.
