Does Silver Turn Rainbow?

Silver coins and jewelry can develop colorful tarnishing called toning over time. This rainbow effect is caused by the silver reacting with sulfur and other chemicals. While some silver collectors value toned coins, others prefer the untarnished brilliance of polished silver. This guide will explain what causes tarnishing on silver, whether it affects value, and how to care for your silver pieces.

What Causes Tarnish and Toning on Silver?

Silver tarnishes due to a chemical reaction when it is exposed to sulfur-based compounds in the air. As the silver atoms interact with sulfur, a layer of silver sulfide forms on the surface giving it a darkened or tarnished appearance.

Over time, the tarnished layer can develop vivid blue, purple, red and rainbow hues called toning. This toning occurs when the silver further reacts with trace chemicals like hydrocarbon residues. Heat, humidity and light exposure accelerate the toning process which is why some antique silver coins exhibit more extreme colors.

Does Tarnish Decrease the Value of Silver?

Tarnished or toned silver is still real silver with the same precious metal content. The toning is merely a surface effect and does not damage the underlying material. So tarnish does not make silver less valuable in terms of its silver purity and weight.

However, collectors who prefer the bright untarnished look may discount heavily toned silver coins or antique jewelry. Light toning can increase value for some collectors, but black tarnish is generally seen as damaging. Harsh cleaning to remove tarnish also reduces value.

How to Care for Silver Jewelry and Coins

To keep silver shiny, avoid exposing it to sulfur-laden environments like rubber, wool, eggs, olive oil, and latex that can trigger tarnishing. Store silver in air-tight containers to limit exposure to humidity, gasses and chemicals that causes toning.

Gently polish away any tarnish with a jeweler‘s polishing cloth or anti-tarnish strips. Never use abrasives or cleaning solutions which can scratch the surface. Wearing your silver frequently also helps retard tarnish buildup.

For lightly toned antique coins, many collectors prefer to leave the toning undisturbed as it is part of the coin‘s natural aging history. Harsh cleaning destroys this delicate patina and significantly reduces collectible value.

Interesting Facts About Silver

• Silver has been prized for jewelry and currency for thousands of years dating back to ancient civilizations.
• It has the highest thermal and electrical conductivity of all metals.
• Silver is the most reflective metal which is why it is used to coat mirrors.
• Pure silver is too soft for jewelry so it is alloyed with copper to increase durability. Sterling silver is 92.5% pure silver.
• The ‘silver screen‘ describing early black & white films refers to the silver metal coating used on movie screens.

In summary, tarnish and toning are naturally occurring processes on the surface of silver that do not damage the purity or value. With proper care and storage, you can retain the shiny brilliance of your silver jewelry and coins. Let your personal preferences guide you in whether to polish away tarnish or appreciate the toning patina.