I wrote just a short week ago about my Lortone rubber barrel tumbler.
I do a three step polish of my cast pieces. Rio’s medium and fine
plastic media two hours each , final step is stainless steel one to
two hours. All was going well for four weeks. Then suddenly the
sterling silver pieces came out a gun metal grey. It seemed sudden.
Several of you wrote and I tried several things to clean the stainless
steel. Dawn dish soap once, Coke Classic once. The shot seems
reasonably clean. So I then put some new cast pieces that I had just
oxidized, in Liver of Sulfur, in the rotary tumbler with the clean
stainless steel shot and Rio’s descaler. Oh I also had a chain that
was a little dull so threw that in also. On hour later I took them
out. Now this is strange: the chain was lovely, shiny and bright,
the other cast pieces that had been in the Liver of Sulfur was the
dirty gun metal color. So now I have a clue but since Liver of Sulfur
is the only oxidizer that I have ever used I am not sure why this
happened. Any clues? Coit PS: I would love to get this figured out but I
have gone ahead and used my buffer to do the polishing so I am not in
a panic as before.