pot metal

Noun

 * 1) The metal from which iron pots are made, different from common pig iron.
 * 2) An alloy of copper with lead used for making large vessels for various purposes in the arts.
 * 3) A kind of stained glass, the colours of which are incorporated with the melted glass in the pot
 * 1) A kind of stained glass, the colours of which are incorporated with the melted glass in the pot