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 Replies: 88 / Views: 6,056 |
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Pillar of the Community
 United States
1502 Posts |
But it is an alloy Marve, not clad or plated. I'm interpreting that statement as a disclaimer for non-alloy coins only. XRF can typically read up to 50 microns deep.
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Moderator
 United States
15437 Posts |
I'm suspicious about the missing 9% - good assumption is that is the MN. If this were an off-alloy coin, and you paid for an error read, then why is it not labeled as such?  Take a look at my other hobby ... http://www.jk-dk.art |
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Moderator
United States
96315 Posts |
I would have to agree with most of the others that the missing % is Mn.
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Valued Member
 United States
67 Posts |
Called NGC this morning and opened an inquiry which they're looking into. The coin was flagged as a standard composition War Nickel which is clearly not correct just given the copper and silver percentages are each off by 5%. Hopefully will hear back soon. |
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Moderator
United States
188660 Posts |
Very interesting.  |
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Pillar of the Community
United States
5672 Posts |
Might be related to inconsistent alloy mixing. I seem to recall that quality control in War Nickels was not great, and metal composition is not always spot on. The fact that your coin has a large lamination also suggests a metal alloy issue. |
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Bedrock of the Community
United States
25270 Posts |
Here is the reverse of OP's coin, showing a lamination. This indicates that there is improper alloy mixing, hence the anomalous XRF reading.  Inordinately fascinated by bits of metal with strange markings and figures
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Bedrock of the Community
United States
10547 Posts |
Quote:
This indicates that there is improper alloy mixing, hence the anomalous XRF reading. Excellent information!  |
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Valued Member
United States
67 Posts |
So I have news, took the coin to a local company that sells xrf machines. Had them test the coin in multiple spots both front and back, generally came back as 80% silver and 20% copper. No manganese or any other metals detected. Not sure if the plastic holder is affecting things but this is getting very interesting.
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Valued Member
United States
67 Posts |
Testing machine was a goldscope sd510, attached results.  |
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Moderator
United States
188660 Posts |
Quote:
Had them test the coin in multiple spots both front and back, generally came back as 80% silver and 20% copper. No manganese or any other metals detected. Not sure if the plastic holder is affecting things but this is getting very interesting. Indeed. |
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Pillar of the Community
United States
1791 Posts |
Edited by Seeker_101
01/16/2025 12:36 pm
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Valued Member
United States
67 Posts |
Thank you Seeker_101, that's what I thought. The plastic shouldn't affect it much at all. But this % result is wildly different from NGC's. However both NGC's report and this result shows two things in common. Being over-silvered and having no manganese.
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Bedrock of the Community
United States
25270 Posts |
These latest results are not inconsistent with improper alloy mixing.
Inordinately fascinated by bits of metal with strange markings and figures
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Valued Member
United States
67 Posts |
Hondo, there definitely could be improper alloying going on but there would still be some amount of detectable manganese.
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Replies: 88 / Views: 6,056 |
First Page
Posted 01/14/2025 06:31 am
