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Green on Coins

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initall View Drop Down
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    Posted: 07 Jul 2010 at 6:05pm

Hi Everyone,

 
I recently inherited a coifrom the of the collection there are a few books that have coins that are turning green.
 
I am in the process of transferring them to the holders that won't turn them green, but am wondering if there is a way to clean them without hurting the value.
 
Thank you,
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admin View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote admin Quote  Post ReplyReply Direct Link To This Post Posted: 08 Jul 2010 at 12:29pm
If they are valuable cleaning coins by yourself is not recommended.  check with NCScoin for proper cleaning. To clean by yourself, there is a very specific process and chemicals needed. I recommend a Google search and compare at least 5 sites because people give all kinds of bad advice.  
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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: 10 Jul 2010 at 2:36pm
Originally posted by admin admin wrote:

If they are valuable cleaning coins by yourself is not recommended.  check with NCScoin for proper cleaning. To clean by yourself, there is a very specific process and chemicals needed. I recommend a Google search and compare at least 5 sites because people give all kinds of bad advice.  
Unflortunately that is so true of the internet. People, but usually kids, read something, somewhere and want to sound like a genius so they repeat it. Maybe not intensionally but due to human nature stories change each time they are told. When it comes to cleaning coins, this is no exception. There are even web sites on how to clean a coin and those too are a little on the wierd side.
I suggest you simply try distilled water. If that doesn't help, I suggest not going any futher unless you really know what your doing.
just carl
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Post Options Post Options   Thanks (0) Thanks(0)   Quote coinshop.com Quote  Post ReplyReply Direct Link To This Post Posted: 18 Aug 2010 at 6:13pm
What type of coins?   If they have green, that sounds like PVC.  That's what causes a green ooze on coins.
You can get PVC off of coins without a problem.   If they are silver.   I you'd like to know, just post a post here and I'll give you a step by step.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote just carl Quote  Post ReplyReply Direct Link To This Post Posted: 21 Aug 2010 at 4:54pm
Originally posted by coinshop.com coinshop.com wrote:

What type of coins?   If they have green, that sounds like PVC.  That's what causes a green ooze on coins.
You can get PVC off of coins without a problem.   If they are silver.   I you'd like to know, just post a post here and I'll give you a step by step.
The above is exactly what I was saying about statements without really knowing what is being said. Not all green STUFF is PVC.  As usual this is what someone has read somewhere and just repeats, repeats, etc. Almost always a Green Patina on any Copper coin is from a form of Oxydation. This is also true of Copper piping in and around a house.
First the Copper is attacked by Oxyger to form Cu2O. This is  usually the darkening of Copper. Then as this process continues this Cu2O is attacked by CO2 and Moisture in the air H OH  otherwise called H2O. Together this becomes Copper Carbonate [CuCO3-Cu(OH)2]. This is the normal Greenish Patina on Copper coins as well as Copper piping.
A further attack from an outside source is from SO2 in the air which creates CuSO4 or Copper Sulfate or Sulfite.
NOT PVC.
So be carefull when someone tells you what something is and has little to no real knowledge of what is that green stuff.
And as already noted the removal is dangerous. Any contamination such as a greenish patina when removed MUST take some of the original material off with it.
just carl
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Post Options Post Options   Thanks (0) Thanks(0)   Quote watts Quote  Post ReplyReply Direct Link To This Post Posted: 25 Aug 2010 at 9:27am
and then there is vergidis, or is that what you are refering to carl?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote watts Quote  Post ReplyReply Direct Link To This Post Posted: 25 Aug 2010 at 9:28am
verdigris maybe, not sure of the spelling
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Post Options Post Options   Thanks (0) Thanks(0)   Quote just carl Quote  Post ReplyReply Direct Link To This Post Posted: 31 Aug 2010 at 12:12pm
Originally posted by watts watts wrote:

verdigris maybe, not sure of the spelling
 Again another of the many used terms for just STUFF. If anyone spent the time looking things up, and the internet is really full of both good and bad info, you would again find that even Verdigris is commonly misunderstood. It usually takes an Acetate to create Verdigris but since so many now call anything green on Copper, Verdigris, it is sort of becoming like the word PENNY. Klenex too is sort of like that. Once most call something whatever they call it, that becomes  what everyone calls it. Karate is not an American Word but since everyone uses it as American, it is now accepted as ours.
Many people today are just stuck on what everyone uses as a standard terminology of something and Verdigris is just that. I'm just waiting for people to start saying the green on plant's leaves are Verdigris. LOLLOL
just carl
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