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Replies: 22 / Views: 1,009 |
Pillar of the Community
 United States
4580 Posts |
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Pillar of the Community
United States
2139 Posts |
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Bedrock of the Community
 United States
18375 Posts |
It looks like staining to me.
Inordinately fascinated by bits of metal with strange markings and figures
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Pillar of the Community
  United States
4580 Posts |
Hondo, can staining physically peel off the coin? I'm 90% confident that the substance is copper.
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Pillar of the Community
United States
3343 Posts |
Looks like an annealing issue to me as well.
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Moderator
 United States
162946 Posts |
Very interesting. 
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Pillar of the Community
  United States
4580 Posts |
The devices are the reason that I'm cautious about calling this an annealing problem. Some of those devices (like EPU and the Monticello building) appear to show circulation wear, but no break in the copper. That suggests to me that some chemical process might have done this after a long period of circulation.
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Bedrock of the Community
 United States
18375 Posts |
It's paint or something like that. I can't see how only half of the coin could be improperly annealed. Also, notice how the orange color remains in recesses while nearby high points are CuNi color. This suggests to me that the staining has been worn off of those areas.
Inordinately fascinated by bits of metal with strange markings and figures
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Pillar of the Community
  United States
4580 Posts |
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Pillar of the Community
 United States
7174 Posts |
I'm in the staining camp.
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Bedrock of the Community
United States
58726 Posts |
Very interesting find. 
Errers and Varietys.
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Pillar of the Community
United States
4010 Posts |
Looks to me like it has been in a rusty tool box.
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Pillar of the Community
United States
1373 Posts |
I'm in the paint/stain camp, but I've been wrong many times. If you ever had a bulk TPG submission, you could send it in for grins.
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Pillar of the Community
United States
5623 Posts |
Does acetone remove paint? Try that - won't harm the coins then
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Pillar of the Community
  United States
4580 Posts |
Quote: An overnight soak in acetone did not affect the copper area, which seems to be flaking along the edges of the coin. The coppery area is impervious to acetone.
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Moderator
 United States
70505 Posts |
Maybe a science experiment? I mean the reverse is almost exactly half the coin is colored. maybe it was dipped?
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Replies: 22 / Views: 1,009 |