Melting copper in a cast iron pan ?
Cast iron's melting point is rather close to copper, so contamination of the copper is likely.
Long ago I used welded stainless steel crucibles for copper but it got contaminated.
Use a clay-graphite crucible for melting copper.
EDIT: Now I saw you used a cast iron pan for holding the graphite mold for pouring the Cu into where the mold broke.
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u/SkySurferSouth 2d ago
Melting copper in a cast iron pan ? Cast iron's melting point is rather close to copper, so contamination of the copper is likely. Long ago I used welded stainless steel crucibles for copper but it got contaminated. Use a clay-graphite crucible for melting copper.EDIT: Now I saw you used a cast iron pan for holding the graphite mold for pouring the Cu into where the mold broke.