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Lead sucks for heat transfer, as do most other metals in comparison to silver, copper, gold, and aluminum.
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It's strange that they're all non~ferrous, with a direct comparison of quality to 'disolvability'. ALu corodes quickest, then Cu, I don't know about Gold or Silver but don't they tend to tarnish rather than corrode(?). perhaps some kind of Cu~gold/silver Alloy is what we need?...
PS, Cu corodes in the long run does'nt it?. I seem to remeber seeing bits dug up (or from the sea) that were once armour, ect...