Mold colors white gold brown

Michael castaldo;

I just ran across this old email, which I had neglected to reply to.
Yes, I would like to try your mold material. Also, I have another
problem. When I vulcanize a mold on white gold it colors the gold
brown, This is very difficult to remove. I have tried many different
solvents and acids with no luck. How can I remove it?

Dave Anderson
Erik Jewelers