Melting Dental Gold
The only way to be 100% sure of the chemical composition would be to
have it professionally assayed. Separately, you have to remove the
extraneous or undesired elements. To be totally honest, I'd be
tempted to tell the buyer to buy the proper alloy in new material. I
think it is too hard to make a high-quality product from the jewelery
equivalent of "mystery metal".
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