Do I waste my time, $, and energy backing copper that might not
I doubt that anyone can answer this-- it all depends. If the design
is strong, it may be worth it-- all-copper jewelry cannot usually be
sold for enough to make it profitable.
But here are a couple of thoughts you might want to bear in mind.
First, copper can still turn the wearer's skin green if it is
backed-- it will still rub on the inside of the adjacent fingers. On
the other hand (so to speak), I made a pair of copper and silver
wedding rings (they insisted on copper and silver, and would not let
me line the rings) and the couple don't have green fingers. They
wear them all the time, and the copper has stayed what I call "baby
pig pink" from the constant abrasion.
And here's something you might not have thought of (I know I never
would have). Copper and silver expand differently when heated. If
you put copper over silver, then close a band to solder it, the
joint will open up when you heat it. You say, "Geez, I must be
slipping-- I thought that joint was tight!" You quench it to
readjust it, and lo and behold! it is tight again. You have to wrap
it in binding wire or some such to keep it together.
If you made a copper lining for a silver ring, I suppose it would
make the joint tighter... :>)