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Tire shops not so good any more. Wheel weights for mag wheels contain zinc. 1 part zinc to 10,000 parts lead is no good.
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Zinc is easy to cull. It's harder than lead, so a simple test with pliers will tell you immediately. Or, you can tap it on concrete, it sounds different. Even if it goes in the pot, as long as you're not running way too hot, it'll float long after the lead has melted.
Chris