Very curious Mona. I test every batch of Baldwin's Patina on an
etched mokume-gane sheet. I have never seen this happen. My only
suggestion would be to depletion plate the piece. That is warm it
with the torch until a little color begins to appear on the sterling.
No flux. Then pickle it. Do this maybe four or five times. That
should pull the copper from the sterling and leave a more or less
fine silver surface on the sterling. Then use Baldwin's following the
wet and warm instructions that came with it. Bill
Thank you, Bill, Deborah, Michele & Sarah
Reactive Metals Studio, Inc.
800/876-3434 928/634-3434 F928/634-6734