In article , Ed Huntress
says...

Be aware that if you place the solder on copper, or on any other metal with
which it will amalgamate, and if you heat it slowly, you will wind up with
intermetallic compounds in the solder that will keep raising its melting
temperature as your experiment proceeds.

Err, not *always*. Try to solder some gold wire
with lead/tin solder, Ed! You might be suprised
at the result.



Jim

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