A cast glass paperweight made in a hemispheric mold (half a ball) fired in a glass fusing kiln. It is first fused, cold worked fire polished and then annealed.
Cullet is used to minimize air bubbles that are usually present in frit casting.
To make cullet or frit - insert scrap glass between sheets of newspaper place on concrete, tap with a hammer until the pieces are reduced to the required size.
Always wear safety glasses as some fragments may escape from the paper.
The pieces are larger than coarse pieces of commercially bought frit.