Many years ago I had a buddy with a radiator shop who used to give me his scrap solder. He never reused it. I cast it up into 2lb Lyman ingots, the same as my wheel weights. I marked them with a felt pen. Well, I kinda got out of casting for several years and now that I've gotten back to it, guess what? The pen marks have all but disappeared. Any ideas on how to differentiate between the solder and the wheel weight? I do remember the solder was 40% tin if that helps.
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