Is this pewter?

[bangerjim]

I'm confused...

I understand the whole zinc froth thing showing up in in a zinc contaminated lead alloy, but why the froth reaction from a single melted object? Is zmack poured/formed in a process way different than an open pot casting method we used?

I mean the op is melting down something he believed to be pewter. Regardless of the composition of that item why/how can the object's alloy change and turn into the glob of uncastable whatever pictured?

Commercially cast Zamac is generally rotationally molded under pressure, which is a totally different process than our simple gravity-fed casting pots and molds. I am sure someone on here has worked in the industry and can explain the process to you.