Whether your jewelry is made of pure silver or sterling silver (which is typically an alloy of 92.5% silver and 7.5% copper), it can tarnish. Silver tarnish is caused by reactions with chemicals (such as sulfur and hydrogen sulfide) in the air or in items with which it comes into contact. Sun, heat, moisture, dirt and oils can all accelerate tarnishing.
To prevent silver tarnish, make sure it is clean and dry before storing, and store in a cool, dark place. For a more thorough cleaning, wash it with a mixture of water and a phosphate-free detergent, rinse well, and dry with a soft cotton cloth. Or, if you’re in a hurry, as most of us usually are, simply wipe your silver jewelry down with a clean, soft, cotton cloth before storing.
Putting your jewelry in a zip lock bag, and adding an anti-tarnish strip to the bag or to your jewelry box can also help slow the tarnishing process, but note that the strips will need to be replaced every three months or so. Jewelry-sized zip lock bags and anti-tarnish strips (I like the strips from 3M) can be found online or at most craft stores.
