Final answer:
Lost-wax casting is the process of putting molten glass into a mold. It involves coating a clay mold in wax, pouring out the wax, and filling the empty shell with molten glass. The mold is then broken to remove the glass sculpture.
Step-by-step explanation:
The process of putting molten glass into a mold is called lost-wax casting. In this technique, a clay mold is coated in wax and covered in plaster. The wax is then melted and poured out, leaving an empty shell to fill with liquid metal or glass. The molten glass is poured into the mold, allowed to cool, and then the mold is broken to remove the glass sculpture.