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Corroded?

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fitey8 View Drop Down
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    Posted: 01 Mar 2008 at 2:27am
My 93-s came back from ICG as VG10 Details, corroded, does anyone else agree with this? I thought maybe that streak on the back might be the corroded spot, but it looked just like tarnish or toning to me. Either way, how can I identify corroded coins in the future? I thought I could but I guess I was wrong.
-Sean
 
 
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just carl View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote just carl Quote  Post ReplyReply Direct Link To This Post Posted: 01 Mar 2008 at 9:04pm
Not sure exactly what they mean by corrosion. You should probably contact them for an explanation. Corrosion on metal is usually referring to accumulated Oxygenation and exposure to moisture. This means the metal itself has combined with outside elements to form a crust or what would be called rust by some. Slight amounts are noted as toning or tarnishing. This is normal when you see Silver darkening or changing colors to a small degree. Since the bottom of the photo may actually be showing a very dark section of the coin, this tarnishing  may be sufficient enough for them to discribe it as corroding.
In answer to your question on how to avoid this in the future, just keep away from excessively darkened Silver coins that may show additional buildup of material.
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fitey8 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fitey8 Quote  Post ReplyReply Direct Link To This Post Posted: 02 Mar 2008 at 3:07am
Ok, thanks carl. Before I sent it in I took it to two dealers and they didn't say anything about corrosion. But unfortunetly what a slab reads is the word of god so I might send it in again for a second opinion.
-Sean
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Post Options Post Options   Thanks (0) Thanks(0)   Quote just carl Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2008 at 2:50am

ICG? If I were you and planned keeping that coin in a slab I'd consider sending to PCGS or NGC. Preferably PCGS. Being in a slab lately is loosing it's appeal unless one of the big TPG services such as PCGS. One of the reasons is just what happened to you. I read somewhere there are now 107 TPG services. Maybe more since I read that. Due to this many are fly by night outfits but it may effect others. If they judge one way, and someone else does differently, they may not be in buisness long.

The two dealers you took that coin to probably saw what I did and just ignored the fact that the coin is starting to tone although with a blackish touch. Looks more to me like what people get on Silver Dinnerware, normal, everyday tarnishing.

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fitey8 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fitey8 Quote  Post ReplyReply Direct Link To This Post Posted: 03 Mar 2008 at 5:52am
Well since we're on the subject, how can I send in a coin to NGC? Don't you have to be an ANA member?
-Sean
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Post Options Post Options   Thanks (0) Thanks(0)   Quote just carl Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2008 at 3:04am
Not sure about NGC's methods but if you go to thier web site I'm sure they would explain how to do that. I know on the PCGS web site there are instructions on how to send in coins for grading. And no you do not have to be a member on anything. It's just that when you join any of those TPG services, you can send in sometimes several of them free. If not a member, there is fairly decent charge.
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fitey8 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fitey8 Quote  Post ReplyReply Direct Link To This Post Posted: 05 Mar 2008 at 7:12am
Ok, thanks a lot Carl. Since I posted those pictures I showed the coin to two dealers and they disagreed with the corroded label. They also said it was just toning/discoloring, whatever you want to call it. Thanks for your help.
-Sean
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Post Options Post Options   Thanks (0) Thanks(0)   Quote DoubleDie Quote  Post ReplyReply Direct Link To This Post Posted: 06 Mar 2008 at 9:04am
No. Silver does not readily corrode unless subjected to an acidic substance. However, it can be damage by the environment the coin is kept in.
 
"Silver can suffer from sulfide-related tarnish and can corrode under very aggressive conditions such as in archeological contexts, but it is often fairly stable." Source AIC
 
IMO PCGS might not grade it, while ANACS would label it environmental damage. I do agree, it would be better in a PCGS holder, but you may have to settle one of the other top four.
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