Pewter is a metal alloy, made up mainly by tin. Copper, antimony, and bismuth are incorporated to give it more strength and to facilitate its smelting. It has a low melting point, which facilitates its workmanship. It was commonly used in the Middle Ages, but substituted with glass crafts in the XVIII to XIX centuries.
Pewter is made by melting the tin in an iron container, adding the copper once the tin is molten. The copper will go to the bottom of the container because it’s heavier. The copper will integrate to the tin at a relatively low temperature, once this has happened, the antimony and bismuth are added, they will incorporate smoothly to the mix. This has to be done before the mix exceeds the 750 degrees Fahrenheit. Once this combination has been mixed well, it is poured into the molds.