Copper Content
Copper is the most common metal used to round out the 7.5 percent alloy balance in sterling silver. It adds hardness to pure silver, but brings with it a tendency to tarnish--a darkening that occurs when sterling silver reacts with gases in the air or with other substances that it comes in contact with.
Storing Your Sterling Silver Jewelry
An important part of maintaining your sterling silver jewelry comes in choosing the proper place where to store your sterling silver pieces. Elements, such as humidity and open air, can cause your sterling to tarnish.
Tarnish is caused by the silver oxidizing from the moisture in the air and light that shines on the jewelry.
A tarnished item turns from a golden color to (eventually) a rich black color that does not allow you to enjoy the true shine and luster of your sterling silver jewelry.
So how do you prevent your sterling silver from tarnishing? Store your pieces in an air-tight, sealed container or bag when you’re not wearing them. In addition, using a special tarnish proof cloth, or zip lock bags made of polyethylene may assist in preventing your jewelry collection from tarnishing. Note: These bags must be made of polyethylene, and not polyvinyl plastic bags. These bags may contain sulfur elements that can expedite the tarnishing of your sterling pieces.
Items that may further damage or tarnish your sterling silver jewelry:
When storing your jewelry, attempt not to:
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Store with rubber (leads to quick tarnish)
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Store with other metals, such as nickel, copper, etc.
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Store directly on wood surfaces (wood contains acids that ruin the finish of the silver)
Corrosion
As the purity of the silver increases, the problem of corrosion or tarnishing also increases.
A number of products have been developed for the purpose of polishing silver, such as Twinkle Silver Cream and Wright's Silver Cream, which serve to remove sulphur from the metal without damaging or warping the metal. As harsh polishing and buffing can permanently damage and devalue an antique piece of silver, valuable silver is typically hand-polished to preserve the unique patina of an older piece. Techniques such as wheel polishing, which are typically performed by professional jeweler or silver repair company, are reserved for extreme tarnish or corrosion.
The bottom line? MAKE SURE YOU STORE YOUR JEWELRY IN A SEALED, CONTAINED PLACE TO ENSURE THAT IT MAINTAINS ITS LUSTER.