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Effect Of "Dark Spots" On Grading

 
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Author Previous TopicReplies: 7 / Views: 262Next Topic  
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United States
26 Posts
 Posted 07/29/2020  5:48 pm Show Profile   Bookmark this topic Add navycapt1635 to your friends list Get a Link to this Message
While I'v come to understand the fundamentals of grading, I haven't seen anything that addresses "dark spots" on coins and their effect on grading. I am posting a photo of a FDR dime reverse that I would estimate is in the low-to-mid MS grade without the spots. Can anyone please help?

Thanks.

Bill
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United States
521 Posts
 Posted 07/29/2020  5:58 pm  Show Profile   Bookmark this reply Add Nieuw to your friends list Get a Link to this Reply
Looks like a fingerprint of some sort
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United States
8975 Posts
 Posted 07/29/2020  6:34 pm  Show Profile   Bookmark this reply Add panzaldi to your friends list Get a Link to this Reply
since eye appeal is a key component in grading it all depends on the size of the spots, how prominent they are and where they are located. thats not an easy question to answer as it can be bad enough to receive a details designation or not affect grade at all.

in the case of your coin. I dont think it would details the coin but may affect value a little
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United States
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 Posted 07/29/2020  7:24 pm  Show Profile   Bookmark this reply Add Coinfrog to your friends list Get a Link to this Reply
In the specific case of fingerprints, they always reduce the value - the larger the print, the more the hit.



to the CCF!
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Australia
17154 Posts
 Posted 07/29/2020  8:55 pm  Show Profile   Bookmark this reply Add sel_69l to your friends list Get a Link to this Reply
Dark spots are just a small areas of very thin corrosion, composed of mainly silver (less so copper) silver / copper oxide sulfide complexes. Cannot be removed with acetone, because they are inoraganic.

Fingerprint stains are of the same chemical composition, also cannot be removed.

Although they are not characteristic of wear,
they do affect the eye appeal, and thus lower the value, critically so on MS graded coins.
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United States
4095 Posts
 Posted 07/30/2020  07:57 am  Show Profile   Bookmark this reply Add fenton to your friends list Get a Link to this Reply
Usually the impact on technical grade is fairly minimal but some people will avoid slabbed coins that have unattractive toning hence the old adage "buy the coin not the holder". Note that on MS coins most toning will come off with an acid dip so investors tend to prefer original surfaces since they know the original "ugly" coin is a dip away from "blast white". Blast white is becoming less popular since most of those are assumed dipped.
Edited by fenton
07/30/2020 07:59 am
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United States
26 Posts
 Posted 07/30/2020  08:23 am  Show Profile   Bookmark this reply Add navycapt1635 to your friends list Get a Link to this Reply
Great answers! Thanks a lot!
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Brazil
18 Posts
 Posted 08/01/2020  10:29 am  Show Profile   Bookmark this reply Add FullStepper to your friends list Get a Link to this Reply
This is why they say an AU 58 can be worth more than a MS 63. All the details can be there but really.
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