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GREAT COLLECTIBLES at GREAT PRICES Brown or Red Rust Spottingon Genuine Gold Coins and BarsCoin Collector's Questions and Lynn Coins AnswersCoin Question: The one troy ounce PAMP ' Fortuna ' bar (sealed in plastic) that I have looks like it's developing spots of rust (brown or red in color). I've had it for four or five years and bought it from another company. (The ' Credit Suisse ' gram blister I have from Lynn coins is fine.) Does this mean it is gold plated or fake?
Related Coin Question: I recently auctioned some Swiss Helvetia gold coins on Ebay that I have had for over a year. I noticed that all of the coins have small red spots that look like (red or brownish) tarnish. I was wondering if this was a natural thing that happens to gold. Or, would this be from something else, say if they were fakes made out of iron? I ask because the person that I sold them to is now asking for a refund because of the spots which I clearly pointed out in the auction. I was hoping you could provide me some insight as to what may have caused the spots. Lynn's Answer: Excellent
question!
Often the a faint amount of trace metal or other material will get on the dies prior to the striking of the coin or bar. When the coin is struck the molecules of the other metal (or impurities) are then fixed into the coin. They may be so thin or dispersed that they are not obvious to the naked eye. Other times such impurities may come in contact with the coin blank before striking it into a coin.. This surface discoloration can occur on gold coins and gold bars.
Most gold coins are between 90 to 92% pure gold depending on the country of issuance. Copper or silver are added to the gold during the melting process to give the finished solid gold coin a hardness. Although during melting the metal molecules are usually mixed well, sometimes traces of copper or silver will be collect near the surface, thereby allowing the change in color in that particular spot.
Is gold spotting a Common or Uncommon Occurrence? I'd estimate that red or brown rust spotting happens on less than 2% of the older gold coins and gold bars we see.
Even pure gold bars or modern gold coins that are 99.9% pure can exhibit rust spotting.
When purchasing a newly minted item, there is really
no way to know that a gold bar or coin will develop a spot in the
future. Sometimes the gold will appear perfect when it comes from the mint,
and then years later the change in color occurs. What to do about it if your gold coin or gold bar has red or rust colored spotting?In most cases coin experts recommend you do nothing to a coin that shows spotting imperfections. Any type of cleaning is abrasive and may reduce the grade of a coin and hurt the coin's value.
Have a question that you think would help other coin collectors? Please email it to us at jlynn@aeneas.net
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LYNN COINS + SPORTS CARDS STORE
John Lynn &
Company
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Gibson, TN 38338
Phone: (731) 787-6645
Email us at: jlynn@aeneas.net
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