I had built a small propane foundry based on one of the internet designs. Worked well for aluminum and copper but my yards wouldn't take them citing unkown alloys (that's a stretch) or heavier metals "entombed" inside your ingot. They just couldn't be bothered. I found there was a lot of waste (due to oxidation) and a lot of dross. I tried to sell on ebay but no luck.
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