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 Replies: 88 / Views: 4,196 |
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Valued Member
United States
236 Posts |
I am just pertaining about the level of XRF machine accuracy; and their associate knowledge. Because I have a similar situation. Yes, if the XRF machine says that this coin contains some percentage of silver, then he or she will have to indicate the results in their findings. They should not make up any other assumptions that can't be proven. Opinion vs fact. We are entitled to our opinions, but not facts; because it can be research. My coin in question is not Jefferson nickel. I will reveal this coin in the near future. After all, coins collecting is a fun hobby. And you don't have to be a Royal. According to me  |
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Valued Member
 United States
67 Posts |
Got new xrf scans done on a Fischer. Attached pictures of the results. Basically the slabbed coin was roughly the same, small amounts of cadmium and palladium showed up. A bit less silver this time at 69%. For the loose coin, this scan appears to be very accurate, it sees it as a standard comp at 54.8% copper, 36.5% silver, 8.7% manganese. The loose coin inside the acrylic capsule was revealing as it showed 49.3% silver, 45.1% copper, 4.3% manganese and .6% paladium. Some conclusions, it looks like the paladium may well be an artifact of the the coin being behind the capsule. It's possible that both the paladium and cadmium are artifacts on the slab, possibly from having an atomic number close to silver. It is looking more likely the slabbed coin has manganese but not entirely conclusive yet as three separate xrf scans still have not seen any trace through the slab and two scans could see manganese on the test coin even through the acrylic.    |
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Pillar of the Community
United States
1300 Posts |
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Valued Member
United States
67 Posts |
Thanks for that, the cadmium and paladium are probably silver that is backscattering from the holders. The keV on all three are close to each other (silver and cadmium 21.7 keV and paladium 23.7 keV)
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Valued Member
United States
67 Posts |
Welp I'll be contacting NGC again. I'm fairly hopeful it doesn't contain manganese as this is now 3 separate XRF scanners and none of them have found a shred of manganese. This last one was a Fischer Niton DXL and that other Fischer URL claims their XRF can read through thick pcgs and NGC slabs https://www.thermofisher.com/blog/m...in-a-holder/The Fischer XL3T300 from yesterday can read manganese up to 440ppm so if any of them were going to catch it, it would have been that one. |
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Bedrock of the Community
 United States
15747 Posts |
Quote:
can read manganese up to 440ppm You must mean that it has a detection limit of 440 PPM, as that is only 0.044%.
Inordinately fascinated by bits of metal with strange markings and figures
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Valued Member
United States
67 Posts |
Just got an email from NGC, looks like they're providing a shipping label and having me ship the coin back to them for xrf review. Maybe they're reading this thread :)
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Moderator
United States
157664 Posts |
Very nice!  Good luck.  |
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Pillar of the Community
United States
3341 Posts |
Cool, that should help clear-up the anomaly on your coin.
I appreciate you keeping us informed on this interesting topic.
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Pillar of the Community
United States
4629 Posts |
Quote:
Just got an email from NGC, looks like they're providing a shipping label and having me ship the coin back to them for xrf review. Excellent - hope they can clear this up!
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Valued Member
United States
67 Posts |
Alright I have an update to the drama. Well this is interesting. I got the relabeled coin back but nothing changed except the cert #. https://www.ngccoin.com/certlookup/.../NGCDetails/I called NGC to find out what happened. They're having me send it back again. According to the notes, apparently one group (I think the one that did the metallurgy test) doesn't think it's an error cause of the chaos of ww2 that affected the mint though they said "I'm sure there's manganese in there" which doesn't sound like they metal tested it again. Also the agent told me that in the notes the Grand President of NGC named Rick (Montgomery?) confirmed that it is a mint error. This has been quite a ride for this poor little nickel &  So I'm sending it back. Again. Will tell them to retest it and say I need a full metal report on paper plus the three most abundant error %'s on the label per their service. Hopefully that will spell it out enough. |
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Pillar of the Community
United States
3341 Posts |
"What a Long Strange Trip it's Been".
Keep us updated!
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Moderator
United States
157664 Posts |
Oh my. Better luck this time. |
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Replies: 88 / Views: 4,196 |
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Posted 01/20/2025 3:58 pm
