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 Replies: 58 / Views: 12,304 |
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Pillar of the Community
United States
2408 Posts |
An old topic http://goccf.com/t/186077 came up regarding the Group of Seven and I decided to open my case... OMG. Now I've been collecting for years and posting on this website for years also. People know me for my images of coins. While I do take good care of rendering above average pictures I will not mess with finishes - unless stated. One of my coins looks like it is plated (weight is 1.3 oz. with capsule like all other coins).  I cannot imagine not noticing this when I received my coin. Maybe it was dark and I didn't pay attention.  Both obv/rev are identical in terms of color.  All coins sat in the same box and in the same conditions for 5 years, untouched. Anyone has a coin like this? Edited by canadian_coins
05/22/2018 11:07 pm
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Pillar of the Community
Canada
5294 Posts |
I think there was another NCLT coin, the Trans Atlantic or so that was in a set that tarnished into a similar gold colour by sitting out in retailers display, still the coin has a really nice hue to it.
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Pillar of the Community
 United States
2408 Posts |
Hi John, But mine stayed in my closet - hum - I mean my bank safety deposit box. No sun exposure at all. Here is a high rez scan:  And under different lighting conditions  Edited by canadian_coins
05/22/2018 11:54 pm
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Pillar of the Community
Canada
5294 Posts |
Maybe something really cool need an XRF
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Pillar of the Community
United States
2408 Posts |
Do you know if PCGS would have such an XRF device?
Edited by canadian_coins
05/23/2018 12:19 am
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Pillar of the Community
Canada
5294 Posts |
PCGS must have, they certify errors like struck on wrong planchets, but as I remember right the goldish colour NCLT coin was XRF and was silver. Large bullion dealers normally will have one with all the fake bullion bars and coins floating around, it is worth looking into if struck in gold be worth quite a few bucks.
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Pillar of the Community
United States
2408 Posts |
This coin isn't gold because it weights exactly like all the other coins in the set.
I still cannot imagine not noticing this gold color when I received the coin!
So it must be the capsule having some kind of chemical reaction with the silver. If that's the case then surely we're not the only ones with this phenomenon... me and the other person who owned the trans Atlantic coin.
There must be others out there.
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Pillar of the Community
Canada
6763 Posts |
Very strange and interesting. but here for example, people say, that the silver turns yellow. https://forum.purseblog.com/threads...llow.129162/They speak about jewelry, though, and explain this by impact of the skin, perfume or lotion on the silver. Maybe this specific coin was impacted years ago (by overexposing to direct light) , prior being encapsulated? Anyway, it worth to check what John advised... |
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Pillar of the Community
Canada
5294 Posts |
Just one other thoughts the gold and silver maple leafs bullion coins all look the same diameter, almost sure the 1 oz. bars are very similar in size.
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CCF Master Historian of USA Commemoratives
 United States
11357 Posts |
@canadian_coins: I checked my set - it also has spent most of its life in the box in a closet - no golden color on any of the coins. Quote:
Just one other thoughts the gold and silver maple leafs bullion coins all look the same diameter... Gold Maple Leaf Coins: Diameter = 30 mm (1.181 in.) / Thickness = 2.80 mm (0.110 in.) Silver Maple Leaf Coins: Diameter = 38 mm (1.496 in.) / Thickness = 3.29 mm (0.1295 in) Collecting history one coin or medal at a time! (c) commems. All rights reserved.
Edited by commems
05/23/2018 01:34 am
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Valued Member
Canada
214 Posts |
That is really strange. I have seen silver coins that sit in our showcase that get exposed to direct sunlight turn yellow or gold. We have always thought it was the lacquer reacting with the light. But if you say yours have been stored away from the light and only one discolored I really have no answer.
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Pillar of the Community
 Canada
663 Posts |
@Gatewest
I have seen Silver coins turn yellow/gold in display cabinets. Usually when there is an LED light source, I assumed it was something in the spectrum but I wasn't sure that Silver would tarnish this way... Are you suggesting there is a lacquer overlaid on the silver after minting.
What is really odd in this case is that both sides are tarnished... Usually when a coin is tarnished in a display case, it is the visible side that gets the toning... the hidden or down side remains silver. Is it possible that there is a flaw in the plastic case that is causing it to offgas and tarnish the silver?
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Pillar of the Community
United States
2408 Posts |
Like all of you I am baffled. I've had coins that oxidized but they usually exhibited some kind of non-uniform hue or rainbow. This coin's "oxidation" is perfectly uniform, and on both sides. Not only the coin surfaces, but the edge as well! I think there is a chemical reaction inside the capsule and I want PCGS to examine what's going on in there if they can. I'm not sure how that can work and what it would cost but it would be nice to get to the bottom of this. They should be able to tell if this has some kind of plating. I know silver will normally oxidize over time but there is just no way this is what happened here, so quickly. Maybe it's the RCM experimenting with a new technology... silver turning into gold over time. That's one way to help NCLTs maintain their value. |
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Pillar of the Community
Canada
5294 Posts |
Our moderator might be able to help you, he has access to these types of equipment if he had the time, try contacting him
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Pillar of the Community
United States
2408 Posts |
Thanks John. BTW I took a closer shot.  |
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Moderator
Canada
10438 Posts |
Looks gold-plated to me... is the reeding (rim) also the same colour? I assume you did not look at it or photograph it when you received the set? Even if it was gold plated, the hardest part would be to prove that the Royal Canadian Mint did it (and not post-mint plating by someone random)... (I believe you - but how does one actually prove this, without the RCM admitting it - and five years after the fact, it might be difficult.) "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy ebay store
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Replies: 58 / Views: 12,304 |
Posted 05/22/2018 11:33 pm
