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If it is cooling with a blue tint it would indicate that it is lead a pure as we can get it. If it hardens with a frosty appearance then I would suspect there is a small amount of tin in there.
You do not need to flux pure lead. That is only done when using a tin/alloy mix and the tin separates out.
Anything that floats to the top of the melt with unalloyed lead is dross and needs to be skimmed off.
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