To remove the copper plating from silver due to iron contaminated
Empty and clean out your pot and make up a new batch of pickle and
heat it. Drop in the item and add a little hydrogen peroxide. The
peroxide degrades very quickly to water and oxygen (it’s monovalent
oxygen in solution to begin with which is what will turn the copper
into copper oxides that are easily dissolved in the pickle)and the
pickle is immediately reusable in the normal way.
Gold and Stone