What is tarnish-resistant sterling silver?

Our silver products are made from "non-oxidizing" sterling silver. It is 92.5% fine silver (as is all sterling) and the remaining 7.5% is a proprietary mix of our metal supplier. No sterling alloy can make the claim of completely NON-tarnishing at this point. But our mix of alloys make our silver jewelry significantly more tarnish RESISTANT, so it should keep its shine and luster far longer than standard sterling silver.