Last melt all my fine hair type copper has now been melted to what you see in the picture below.
Slug on the right weighs 5.50 Lbs., had I heated the mould before pouring I would have had a much nicer looking copper button. Also the black coating could be carbon from the oil I pre coat the mould with prior to pouring.
I'm using a large 35 lb slag mould to pour into.
A 6 lb copper melt in a 15 KVA furnace would be its upper limit and not a gram more.
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