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Darkened Spots Around A Coin's Raised Areas

 
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Author Previous TopicReplies: 4 / Views: 312Next Topic  
Valued Member

United States
135 Posts
 Posted 03/20/2021  3:11 pm Show Profile   Bookmark this topic Add Hidalgo to your friends list Get a Link to this Message
I regularly see much older coins, which have been slabbed and certified as Mint State, having dark spots/areas around raised areas and the rims. I presume these certified coins have not been cleaned. How can most of the surface of these coins be clean and only the raised areas and rims be dark/discolored?

Here is an example: https://www.ebay.com/itm/264913695062
Bedrock of the Community
Australia
18427 Posts
 Posted 03/20/2021  6:53 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
eBay item either sold or withdrawn.
Valued Member
United States
135 Posts
 Posted 03/20/2021  6:55 pm  Show Profile   Bookmark this reply Add Hidalgo to your friends list Get a Link to this Reply
Here is a link to another eBay auction, which shows similar darkening near the raised areas.

https://www.ebay.com/itm/1936-S-U-S...264913695062
Pillar of the Community
United States
4396 Posts
 Posted 03/21/2021  9:44 pm  Show Profile   Bookmark this reply Add Greasy Fingers to your friends list Get a Link to this Reply
Anybody......Anybody....I'm waiting to hear an explanation....
I'm by no means a pro and will never claim to be...just my 2 cents
A smile costs nothing to give or receive....GF
If it's not hockey, it's not a sport
Bedrock of the Community
United States
17329 Posts
 Posted 03/22/2021  09:21 am  Show Profile   Bookmark this reply Add Conder101 to your friends list Get a Link to this Reply
In the case of the first coin it has spent years in either a paper wrapped roll or in a cardboard holder. The paper/cardboard contained sulfur compounds which caused the coin to tone/tarnish and the area around the rim/edge of the coin that was in closest contact with the paper/cardboard has toned darker than the rest of the coin.
Gary Schmidt
  Previous TopicReplies: 4 / Views: 312Next Topic  
 
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