Just spoke with a jeweler today and he's going to find me some .999 silver to use to make me a coldplate with. He also mentioned that silver conducts heat much faster than copper, but low grade silver(sterling) doesn't *transfer* heat as quickly. High grade silver conducts and transfers heat quickly. He's going to put some gold into it as well (scrap gold) to improve conductivity and ductility as well. Silver is $7-10 per ounce depending on grade, downright inexpensive really.
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