this post was submitted on 30 Apr 2026
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Cast Iron
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I have a data point of size ~5, when a friend purchased a bona fide lump of lead in order to be the control for his lead test strips. And he basically used the test strips in pairs: one on the object in question (eg cast iron pan, ham radio, etc) and then the other against that lump of lead. There have not been any false-negatives from the lump.