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 Replies: 22 / Views: 2,861 |
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Pillar of the Community
United States
4132 Posts |
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Valued Member
240 Posts |
The coin appears to be in a PCGS holder. (I noticed the three plastic pieces on the rim of the coin.)
So, why is it changing color? I thought these holders were designed to preserve the coin within. Was there something on the surface of the coin before it was placed in the holder? Or, have you exposed the coin to high temperatures for a long period of time. (High temperatures accelerate this chemical reaction/process.)
I have lots of coins in various kinds of holders. They have been there for many years and some for decades. I keep them in a cool dry place ... and I don't see these kinds of changes in color.
Inquiring minds want to know...
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Pillar of the Community
 United States
5029 Posts |
Interesting progression.
Can you provide some details about the environment and other items you have near this coin?
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Bedrock of the Community
United States
20753 Posts |
I've had Mercury dimes in Whitman Albums for many, many years and nothing like that happened. Must be where you keep it. |
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Pillar of the Community
United States
5825 Posts |
PCGS/NGC slabs are not totally sealed so less than ideal storage conditions can (and will) cause changes.
And things can happen faster in geographic areas that include lots of humidity and significant temperature changes.
The American southeast quickly comes to mind.
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Moderator
United States
187672 Posts |
Quote:
3.5 years ago... Today... Very interesting.  Quote:
Must be where you keep it. Quote:
PCGS/NGC slabs are not totally sealed so less than ideal storage conditions can (and will) cause changes. Agreed. Storage environment is just as important for slabs as it is for albums. |
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Pillar of the Community
 United States
4132 Posts |
It is in a PCGS slab. I store it with other coins, in an album with other slabs, mostly containing other toned coins, and those are not changing (or none that I've noticed). They're on bookshelf in a dry, air-conditioned room. I also live in an area with a dry, stable climate and very little weather.
I suspect whatever caused the original toning is still present on the coin; it does have a bit of a dirty/grimy appearance.
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Bedrock of the Community
United States
17884 Posts |
Odd, on my screen it looks like the toning is getting lighter.
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Valued Member
United States
456 Posts |
Mine, too. We're the most images inadvertently reversed?
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Pillar of the Community
United States
4132 Posts |
The lighting and processing are different between the two. The main difference in toning is that the metallic blue color is creeping in from the edges, and it's also developed some dark spots.
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Valued Member
240 Posts |
I wondered if this was a "Photoshop" job (processing) or light color, but your comments about 3.5 years later and toning like a ticking clock prompted me to ask questions.
Edited by jmwilson
10/24/2018 08:23 am
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Pillar of the Community
United States
4691 Posts |
I've had silver coins tone in holders, and some even develop ugly dark spotting. One of them PCGS did their magic and removed the spots and re-holdered.
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Pillar of the Community
Canada
1267 Posts |
Interesting. My first thought is that there must be some form of contamination left on the coins surface.
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Pillar of the Community
United States
3479 Posts |
It's undeniable that coin has toned further in the slab. But it's also a major concern. I've heard of Indian cents changing from red to brown which severely impacts the value of the coin. But this is the first silver example I've seen that has changed in the holder. One of the benefits of storing coins in a TPG holder is the assumption that the coin will be preserved in its present form and will be protected from the elements. So when you see toning changes like this happen inside of a TPG holder it's a bit unnerving. |
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Pillar of the Community
Canada
1267 Posts |
Quote: One of the benefits of storing coins in a TPG holder is the assumption that the coin will be preserved in its present form and will be protected from the elements. So when you see toning changes like this happen inside of a TPG holder it's a bit unnerving. Mike, unless placed in a vacuum, all silver coins will continue to oxidize.....just no where close to the timeframe this particular piece has. That is why my first thought was that there must be some form of contamination still present on the coins surface. Of course if the original toning was artificially accelerated, we could also expect to see continued degradation. |
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Pillar of the Community
United States
3479 Posts |
Do you guys think an acetone bath before the submission would have stopped the toning progression?
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Replies: 22 / Views: 2,861 |
Posted 10/23/2018 03:24 am
