Smelting the last 4lb batch out of 35 lb of soft stick-on wheel weights, and I found a half melted weight. Seemed like it should’ve been melted, so I pulled it out suspecting it was zinc. The top surface of the clean melt had a skin that looked sort of dendritic like my round nose ammo does in 92-6-2 alloy. The lead was in a cast iron skillet, which I poured into my Lyman ingot mold. Unlike the other pours, and skin of metal stayed with the pan. The cooled ingots have that dendrite look as well. The smelting of wheel weights took place over a camp fire, and I cleaned off the dross over a Coleman stove. A better setup would be nice, but I go for free when I am tinkering for the first time.
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I poured Lysol toilet bowl cleaner on the ingots, which in 9.5% HCl. The blue Linda turned white where it made direct contact with the ingot, but I would not say I saw fizz. The white could be on account of the cleaner being 5+ years old. After I washed the cleaner away, there was no etching to indicate a reaction occurred on the surface of the ingot.
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Is it likely I have some zinc in these four ingots, or is it more likely the lead was not as hot as I thought it was?