Why Are Sliver Eagle Coins Browing?
Sometimes, Sliver Eagle Coins do tone or become cloudy. In many case the packaging may be the cause especially if it contains PVC (polyvinyl chloride) a plasticizer (softener). The color may also change if the coin is exposed to air or has been touched in the original process by any kind of contaminant. Another possibility is, if you bought the uncirculated coins there are chances the oils from your hand or the materials that you might use to protect the coins could have caused the change in color.
 5 oz SILVER COIN BICENTENNIAL OF CONSTITUTION 999  US $102.50
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 SILVER IKES KENNEDYS ENGLHARD 5X1 OZ BARS MORGAN LK US $150.00
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 China Unicorn 20 oz Silver Proof Unicorn Coin E49 US $3,550.00
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 Lot Five 5 Ounce Oz Indian Buffalo Silver Coins Pure US $90.05
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 5 RON PAUL 999 Silver Liberty Dollar $25 norfed 1 2 oz US $83.00
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 16 oz 1999 WALKING LIBERTY SILVER EAGLE 999 US $187.50
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Sliver Eagle Coins are prone to tarnish. A Proof coin should have mirror fields that you can read the reflection of newsprint when held 6 inches away. If you do not want the browning to be on the coins there are some s cleaning solutions. Many coins are cleaned to make them appear to be in a higher grade. But, they should never have been cleaned in the first place. It is never a good idea to clean a coin yourself. Seek always a well known professional service for cleaning your coins.
Cleaned Sliver Eagle Coins will drop in value to their respective grade no matter how rare there are. All household products are extremely harmful to a coins surface. Most collectors of valuable coins would rather have the darkness of the coin, since this will generally be a sign that the coin is in its natural state.