



How to fix this grey patina?
I melted some fine Silver and jewelry scraps and I got this gray, green, and brown layer on top of my silver bar. How do I fix this and what is it? I also have these big pits at the bottom of my bar. How do I prevent this next time? The graphite mold was glowing red when I poured. I’m assuming not all of the silver jewelry scraps weren’t .999 fine as I assumed or maybe there was contamination on my crucible.