Wood's metal probably. But it would not work unless it is heated to the
    solder temperature first so it gets a chance to alloy with the remaining
    solder.

It can work because the molten (woods metal) essentially DISOLVES the
solder - no normal-solder-melting temperature required.  I've seen
impressive demos at trade shows along these lines, although I believe
they use an indium alloy ($$$) rather than woods metal...

BillW

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