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 Replies: 27 / Views: 3,095 |
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Moderator
  United States
16679 Posts |
What makes you think the coin came into contact with sulphuric acid? Again, wouldn't this disrupt the original surface of the coin, I mean, much worse in appearance than this?
swcoin.ecrater.com
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Pillar of the Community
United States
709 Posts |
It is the white that is on your coin. I believe it is copper sulphate.
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.
Water and sulphuric acid mist in contact with copper causes copper sulfate. In the presence of water the copper sulfate turns blue. When the water molecules are removed the copper sulfate turns white.
Edited by Ozland
02/02/2011 12:15 am
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Pillar of the Community
United States
958 Posts |
i posted a 1919 woodgrained cent in the modern error forum , kinda looks like yours.
the copper areas look like a dull brass..
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Valued Member
United States
201 Posts |
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Bedrock of the Community
United States
17884 Posts |
I think the 1899 is a case of an improper alloy mix and that area has an unusually high zinc content that results in a big difference in the way the metal tones.
I doubt the white is the result of copper sulfate. If you drive off the water copper sulfate does turn white, but since the water is trapped within the copper sulfate molecules as they are formed it takes several hundred degrees for an extended period to bake the water out of it. Also when it is exposed to water again it will take it back up again and once again turn blue. Copper sulfate is also water soluble so you could wash it off with distilled water.
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Moderator
United States
16679 Posts |
Thanks conder. I have rinsed with distilled water and still there. The 1899 IMO, was something rolled into the stock before the planchets were punched, what, I don't know. Looks just like gold believe it or not. I will let Rick Snow examine that one too on Friday. I will let you all know what he says.
swcoin.ecrater.com
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Pillar of the Community
United States
1081 Posts |
I have a 1905 IHC that has nearly an identical mark as your 1899. Look goldish colored. |
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Moderator
United States
16679 Posts |
David, can you post a pic, I'd like to see it!
swcoin.ecrater.com
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Moderator
United States
16679 Posts |
Well, I met Rick Snow (nice guy!) and showed him both coins. He seemed stumped on both and looked at both for quite some time. The 1906 he said was possibly some kind of plating but he did not know what. He rubbed the edge with his thumb and nothing came off. I asked him about the copper sulfate sulphuric acid thing, and he laughed.
The 1899 he said looks like extra metal (he did not know what kind) was possibly rolled into the planchet stock.
swcoin.ecrater.com
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Bedrock of the Community
United States
10045 Posts |
Quote:
The 1899 he said looks like extra metal (he did not know what kind) was possibly rolled into the planchet stock. That's interesting! Still no idea of composition..  |
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Valued Member
United States
455 Posts |
You have some interesting explanations for the whitish deposits on the two IHCs. Some of you guys seem to know quite a bit about chemistry. Maybe I should take a chemistry class and brush up on my periodic table of elements and chemical equations!
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Moderator
United States
16679 Posts |
He had no idea DV. He actually looked a little puzzled. Probably scrap something or other.
swcoin.ecrater.com
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Replies: 27 / Views: 3,095 |
First Page
Posted 02/01/2011 11:20 pm
