> Russell,
     >  Hydrogen embrittlement is more of a problem
     > on steel parts than aluminum. The problem on
     > Al is making it stick!
     > Bill Jepson

     Maybe they were merely polished.

     Paul Lamar

Paul, they were probably chromed. It is easily done
with a 3 layer system. Copper first, then nickel, and
then chrome. Just costs more. Must be polished twice
as well if your copper plate isn't perfect.
Bill Jepson

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