If you know what you are doing, EZest or MS70 - but you would need to experiment on common melt value coins until you get a feel for how they work or you stand the chance of making the coin look cleaned/dipped and it having an unnatural shine and lifeless look to it. It will take some time to practice. It would also take tiny steps (small amounts - very little time for chemical exposure before rinsing well) using the products in order to conserve this. Diluting the products also would be a good idea before trying.
Also don't use one of the products and then the other without a very thorough rinsing. Any residue from one chemical on the coin and the other chemical will produce an almost impossible to remove black surface and maybe some false color toning.
Again - practice on non-important silver first until you can predict what likely will happen before application.
How much squash could a Sasquatch squash if a Sasquatch would squash squash?
Download and read: Grading the graders
Costly
TPG ineptitude and No FG
Kennedy halveshttps://ln5.sync.com/dl/7ca91bdd0/w...i3b-rbj9fir2