Sterling Silver Hathphool Restoring Sterling Silver That Has Been Emersed In Chlorine?

Restoring sterling silver that has been emersed in chlorine? - sterling silver hathphool

I told my friend a very special ring for Christmas money. Some days we sat in a crowded hot tub and chlorine do not think that would be the number the ring to take. Suggestions on how to restore? If at all possible.