Hi Guys,
I was casting round balls last night, and noticed a golden "scum" on the surface of the molted lead. It didn't seem to bother the casting process, and Marvalux didn't remove it. I was using dead soft lead from lead shielding that had been used around an x-ray room. When left undisturbed for a time, the scum seemed to oxidize further and began to look like rust. The balls are within 1 grain of those I cast a few day before (with different lead), but I'm curious.
Any ideas?
Thanks,
Doug