In an attempt to get a little differant look, a friend has
tried casting with quarters insted of sterling silver. You
know the sandwitch quarters. Problem: The castings have come
out of the investment with a dark finish. The finish is
difficult to remove, like fire scale. We are vacume casting.
Why aren’t the castings clean like with sterling?
I am sure the problem has something to do with the high copper
content or possibly other metals alloyed into the quarters.
Does anyone have any suggestions.