Originally Posted by
Dusty Bannister
Composition:
Modern Pewter ... International standards define pewter as having a composition of 90 to 98 percent tin, 1 to 8 percent antimony and 0.25 to 3 percent copper, with limits specified for various impurities (lead, arsenic, iron and zinc).
There was a valid reason to ask if you knew what was in your pewter. If you have a high percentage of antimony it will more than likely just fracture and break off anyway. If it already has copper, there is little to be gained by adding more. Generally, copper adds toughness. Dusty