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Questionable Color

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Valued Member
daveyn's Avatar
United States
160 Posts
 Posted 09/30/2007  2:02 pm Show Profile   Bookmark this topic Add daveyn to your friends list Get a Link to this Message Number of Subscribers
If this were a US copper coin, I might think the red color on both sides was from heating the coin. I've seen heat cause some nice red green and blue colors to US cents. I'm not sure how these bronze coins tone, is this a natural toning, sure looks questionable to me.


http://www.noblecoins.org/aust1959pennyB.jpg

Thanks,
Valued Member
Firecom911's Avatar
United States
161 Posts
 Posted 09/30/2007  5:37 pm  Show Profile   Bookmark this reply Add Firecom911 to your friends list Get a Link to this Reply

Just my opinion, but that appears to me to be electrolytic discoloration...from contact with something that reacted chemically with the surface of the coin.

The coin may have been in the ground for awhile, or in contact with rusting iron or steel, or touching something that was acidic or alkaline for a period of time.

Steve
Pillar of the Community
Peter THOMAS's Avatar
Australia
2830 Posts
 Posted 09/30/2007  6:21 pm  Show Profile   Bookmark this reply Add Peter THOMAS to your friends list Get a Link to this Reply
G'day, I think Steve might be on the money: look at the shape of the discolouration. This suggests to me that the coin has spent a long time between other objects.
Not entirely relevant to this coin, but to Davey's post: when the 1964 Oz pennies first appeared, they were noticeably redder than other pennies. I never got an explanation for that.
Peter in Oz

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