hi joy. I don’t know if this is what you’re looking for. . . but in
the various processes I use, we often ‘raise’ sterling silver to fine
silver by repeatedly heating it and pickling it, heating and pickling.
I don’t actually know what ‘pickle’ is - I just go to the jewelry
district and buy it! but we use it all the time in metalwork -
whenever we heat the metal we pickle it to clean it. you ought to be
able to purchase pickle in any jewelry supply place. at our studio we
keep it in a crock pot to keep it warm. when you take pieces out of
the pickle, use ONLY copper tongs - if you use steel or iron or
anything else, it will actually ‘plate’ the metal.
to raise sterling silver to fine silver, you should heat and pickle
about 5 times.
hope this was some help!!!