Antitarnish coating/treatment of silver

I am a small scale manufacturer of sterling silver and silverplated products. Recently the demand of these products is declining due to the fact that silver tarnishes readily. I have tried various methods including clear lacquers, proprietory Anti-tarnish dips, even CR6,etc. But none are satisfactory considering life of anti-tarnish/colour/food safe/cost. Recently I have found very basic literature(abstract of a 1993 article by De Bonte) on Codeposition of Silver-Germanium alloys as a good protective tarnish resistant coating.
I would be extremely grateful if someone could inform me more about this process and, if more recent studies have been conducted on this. I am prepared to experiment ( within my resources).