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Bedrock of the Community
 United States
19966 Posts |
quote:
Wow that got ugly as heck. I don't have a clue what happened but I would think something got on it before it was packed or dampness got into it. check the seals on the Mylar and see if it is cracked or not sealed tight.
that's all I can think of. I would cut it out and see if acetone will help save it. it cant hurt lol
It's completely sealed, absolutely NO cracks. |
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Bedrock of the Community
United States
19966 Posts |
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Wow that's actually impressive. I haven't seen one that bad before. About 99% of "Sealed Envelopes" are just repackaged envelopes. Did this come with the entire collection you got or do you know when it was purchased?
Trust me, this definately not repackaged. This was purchased in 1964 by my grandfather. It was in a sealed box it was shipped in directly from the mint along with 4 other identical sets, everything has been sealed since 1964, 110% sure of that. Lincoln Cent Lover!VERDI-CARE™ INVENTOR https://verdi.care/
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Pillar of the Community
United States
1952 Posts |
I would still cut it out and try acetone on it. if you don't want to mess with it give me a good price and I will do it
Gary too
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Bedrock of the Community
United States
19966 Posts |
Took it out today, it's definately inorganic because reagent grade acetone and isopropanol will not touch it. I'm going to look at it under our SEM-EDXRF (Scanning Electron Microscope - Energy Dispersive Xray Fluorescence) to determine the chemical make-up of the film....should be interesting.
Lincoln Cent Lover!VERDI-CARE™ INVENTOR https://verdi.care/
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Bedrock of the Community
United States
19966 Posts |
Most interesting, looked at this coin under the SEM today. The film is some form of oxidized copper and small amount of carbon. There's really only two forms of oxidized copper, Cuprous Oxide (Cu2O) and Cupric Oxide (CuO). Oddly, the color of the film a very light greenish white, whereas Cuprous Oxide is red and Cupric Oxide is black. The oxidation looks more like what happens to aluminum, but there's definately no Al present as I performed a complete EDXRF scan. So, what happened at the mint? The compostion of these coins is 90% silver/10% copper. I don't really know in detail how coins are made, so all I can say is the coin must have been handled/exposed on one side to water. Likely, it was improperly handled because the presence of carbon in the corroded area. I also have to consider the higher level of copper. My guess: Somebody at the mint, who worked with copper, mishandled the coin! I can rest in peace now! LOL For anyone interested, the SEM scans are attached. The top pic is for the "clean" area on the obverse, the bottom is from the corroded area: Image:  scan_resize.jpg87.64 KB Edited by BadThad
06/07/2007 12:25 pm
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Pillar of the Community
United States
2600 Posts |
Oh, you mean the "Bat Scope".  Jim  |
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Bedrock of the Community
United States
19966 Posts |
Oh....what the heck should I do with this coin? I know I could remove the oxidation with weak acid, but will it ruin the proof finish underneath? I tried some reagent grade water, just spraying, didn't touch it. Arrrrgggg....
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Bedrock of the Community
United States
19966 Posts |
quote:
Oh, you mean the "Bat Scope".
Bat Scope.....HAHAHAHAHAHAHAHAHAH  Lincoln Cent Lover!VERDI-CARE™ INVENTOR https://verdi.care/
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Pillar of the Community
United States
1173 Posts |
SEM! I haven't used one of those since 1986/87. Sure wish I had one now to play with when looking at coins. Would certainly give you a great view at any level of desired magnification.  |
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Pillar of the Community
United States
7123 Posts |
Most often that type of thing is caused from a dirty wash at the mint and poor drying afterwards,, its sad but it happens .
Most times it is not removable without affecting the coin .
try a long soak in acetone use a sealed jar and let it soak for a couple of days ,,if it dont come off ,then the only thing left is a dip in MS-70 or something similar .
Metalman
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Bedrock of the Community
United States
19966 Posts |
Who makes MS 70? I'm a chemist and my company makes cleaning products, among many other. I'm sure I can make something similar in the lab. I'd like to find an MSDS for this product.
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Bedrock of the Community
United States
19966 Posts |
quote:
SEM! I haven't used one of those since 1986/87. Sure wish I had one now to play with when looking at coins. Would certainly give you a great view at any level of desired magnification.
Not only an SEM, but one with an EDXRF built-in...I love this instrument, it comes in quite handy. Lincoln Cent Lover!VERDI-CARE™ INVENTOR https://verdi.care/
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Pillar of the Community
United States
3234 Posts |
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Moderator
 United States
23522 Posts |
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Not only an SEM, but one with an EDXRF built-in...I love this instrument, it comes in quite handy.
 OK, you are now the official Alpha Geek of Coin Community. /me tosses his QX5 into the trash |
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Bedrock of the Community
United States
19966 Posts |
OK, then change my member title to that!  |
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Replies: 19 / Views: 2,611 |
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Posted 06/06/2007 8:56 pm
scan_resize.jpg
