Its proprietary. Post a pic if approved for cleaning by me then send. You can then post Before/After pictures. Like NGC Conservation - there are limitations particularly of course with a copper alloy such as black spots, corrosion deep into the fields with copper other than green oxidation, etc.
You can then post here failure or success. Send me a PM. Will pay return postage - if the challenge is accepted. JPL
Although I got my COVID vaccination yesterday its the Winter/ Covid times / bored. Somebody post a picture. In the meantime any questions on Patrick's Canadian Blacksmith Tokens? <VVBG>.
I'd think that once a coin has had a reaction with the environment or chemicals, it can't be reversed. However with silver coins I have never seen pvc damage a coin or toning to be "terminal" contrary to conventional thinking.
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