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 Replies: 27 / Views: 3,089 |
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Moderator
 United States
16679 Posts |
...about this 1906 IHC that has been discussed here before. He emailed back and said he had no idea and can't tell from my pictures  My question is about the white looking areas on the obverse,reverse,and rim. I am going to take it to the Long Beach Coin Expo and get his opinion on it. It is most prominent on the neck and left rim obverse.   swcoin.ecrater.com
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Bedrock of the Community
United States
10045 Posts |
I remember--there are areas which appear to be a different metal; do they look golden?  I hope you can get his opinion on it--and post what he says.  |
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Moderator
 United States
16679 Posts |
Thanks DV! I'm going to ask him about this one too:   swcoin.ecrater.com
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Pillar of the Community
United States
1554 Posts |
Could this be from PVC damage combined with an acetone soaking afterwards. I noticed that this happened to a couple of my Morgans when I soaked them after PVC damage...?...
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Pillar of the Community
United States
1374 Posts |
Just my opinion, the 1906 looks like it has been cleaned with acetone. Not that I would know, I've never used acetone to clean a coin. The 1899 looks like someone accidently brushed it with a Qtip as they were cleaning the 1906. Did you get them together?
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Moderator
United States
16679 Posts |
Quote:
The 1899 looks like someone accidently brushed it with a Qtip as they were cleaning the 1906. Bought separately. The 1906 may have been cleaned at one time but I am just not understanding why the copper has turned white. Under a loupe, looks like part of the composition and not on the surface. swcoin.ecrater.com
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Pillar of the Community
United States
1374 Posts |
By the way, nice coins. Heads up on the 1899, it has a lot of RPDs. I found one and posted it a couple weeks ago. It wasn't in the CP guide, but it was in Rick's book. I was blown to see like 5 pages of RPDs for 1899. Take a close look at your date there, it could easily double or triple the value.
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Pillar of the Community
United States
1554 Posts |
PVC holders when they degrade, emit acid...then a dip in acetone and you can get a white-ish coloring...
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Moderator
United States
16679 Posts |
Will do.
swcoin.ecrater.com
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Pillar of the Community
United States
709 Posts |
I believe the white stuff is copper sulfate. Copper sulfate turns white when it has lost all of its water. The colour of the sulfate is due to the presence of ions .
In the case of copper sulfate when it is hydrated the blue colour is due to the presence of Cu++ ions. When all the water molecules have been lost and no water molecules remain it becomes white.
Edited by Ozland
02/01/2011 9:25 pm
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Moderator
United States
16679 Posts |
That's very possible oz. Thanks for the input!
swcoin.ecrater.com
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Pillar of the Community
United States
1554 Posts |
What would come in contact with the copper to cause that reaction? What would cause the copper sulfate to loose all of its water? I don't know my chemistry. I have seen acetone create whiteness on silver.
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Pillar of the Community
United States
709 Posts |
Water and sulphuric acid. In contact with copper causes copper sulfate.
Edited by Ozland
02/01/2011 10:33 pm
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Moderator
United States
16679 Posts |
Are you suggesting possible contact with sulphuric acid?
The coin would be unrecognizable.
swcoin.ecrater.com
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Pillar of the Community
United States
1554 Posts |
Thanks Ozland....I know PVC when in contact with heat and humidity(water), degrades and emits/becomes Hydrochloric acid.
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Pillar of the Community
United States
709 Posts |
Sulphuric acid is made from sulphur dioxide.
Sulphur dioxide, SO2 is a colorless gas. It smells like burnt matches. It can be oxidized to sulphur trioxide, which in the presence of water vapour is readily transformed to sulphuric acid mist.
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Replies: 27 / Views: 3,089 |
Posted 02/01/2011 7:49 pm
