Letter Re: Is There Utility in Melting Silver for Ingots?
Mr Rawles:s Silver alloys cannot be refined by just melting and skimming the dross from the top–no precious metal alloy can. Silver alloys usually contain copper as a hardener, some of the new sterling used in jewelry is alloyed with other metals to keep it from tarnishing. Simply melting silver will not cause the copper to rise to the top and oxidize. Separating silver from copper requires nitric acid and should not be attempted at home. I’m not sure how some of the other alloys are refined. Furthermore a home chemist will never get scrap silver refined to .9999 or …