This very frosted piece appears to be part of a bottle or jar bottom. There is a B in a circle (but font different from Brockway) and I think it says Tempera. I've been searching paint jars etc with no luck. Does anyone have any idea?
Thx so muchIt's Brockway Glass "Temperglas". Their "B in a circle" trademark may not always look EXACTLY the same from one bottle to another.