Can 80/20 be cleaned up? what have I done?!?
Sure you can "clean it up. But you have to add a much greater amount
of fine silver. You want to reduce that 20 percent copper to 7.5
percent, which means you’ll have to add about twice the weight of
your 80/20 in fine silver. That’s quite a bit. And given the
sometimes balky nature of silver in rolling good sheet metal, it
might be more advantageous to send it to a refiner and trade it in on
good sterling sheet metal. Costs a bit more, but saves lots of time