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If you are making lots of jigs , virgin pure lead makes life a lot easier. If you are doing just a small amount , then you can melt down almost anything. I know that when Smokey and I did thousands , the pure lead made it so much easier as the optimum pouring temp stays the same. when you use scrap lead , you have to play with each crucible load to get a good pouring temp. ASlso , some crap in there can mean you have to pour at a higher temp. this means increased risk from fumes and also beats the hell out of the specialty molds we have for skin jigs. For the regular do-it aluminum molds , pouring temp just means you may have to let the molds cool more often but if you have plaster or rubber molds for specialty shapes , high pouring temps will kill them fast.
I recommend that you buy pure virgin lead in ingot form.
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