| Author |
 Replies: 43 / Views: 12,470 |
|
|
|
Pillar of the Community
United States
2738 Posts |
I haven't subjected any improperly annealed 5 cent errors to XRF analysis. So I can't comment on whether the surface layer of copper (which can be fairly thick) can add 8 percentage points to the normal 75% copper fraction. I'm merely saying that the coin's appearance is similar to other improper annealing errors. Here is a useful summary of the phenomenon: http://www.error-ref.com/improper-annealing.htmlError coin writer and researcher.
Edited by mikediamond
01/25/2013 12:15 am
|
|
Moderator
 Canada
10460 Posts |
The sacrificial lamb, a dateless brown Buffalo nickel, that tested 82% copper on the XRF. Oh, the sacrifices one must make, for science. Before pics:   The coin spent three days in a light vinegar bath, to remove any surface impurities.  Then, the reverse met its untimely end, care of my axe file, until a majority of the surface was bare, fresh metal. Then a quick acetone wash.  I will test both sides with the XRF sometime this week, stay tuned. "Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
|
|
Pillar of the Community
United States
1796 Posts |
 The things we must do for science.  Edited by SteveCaruso
01/28/2013 6:32 pm
|
|
Moderator
 United States
56855 Posts |
 John1  PS, Have you had a chance to mail out my coin yet SPP-Ottawa? Edited by John1
01/28/2013 7:05 pm
|
|
Moderator
Canada
10460 Posts |
You bet - posted Friday.
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
|
|
Moderator
United States
56855 Posts |
Thanks much Roger,I am waiting on pins & needles  John1 |
|
Pillar of the Community
United States
621 Posts |
I know this is a kind of old thread but I have to ask/know how the testing of the shaved buffalo turned out if you were able to test it.
|
|
Moderator
United States
56855 Posts |
justin3651, You should PM the person who did the testing. John1 |
|
Moderator
Canada
10460 Posts |
Rather surprising results... Something I intend to publish later this year...
"Discovery follows discovery, each both raising and answering questions, each ending a long search, and each providing the new instruments for a new search." -- J. Robert OppenheimerContent of this post is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported License. See: http://creativecommons.org/licenses...0/deed.en_USMy eBay store
|
|
Bedrock of the Community
United States
62064 Posts |
75% copper is normal. 25% nickel.
|
|
Pillar of the Community
United States
621 Posts |
"Rather surprising results... Something I intend to publish later this year..." You sir are killing me   . Approximately how long till it comes out do you think? where will you release it on? this subject is one that's really interesting to me.  |
|
Valued Member
United States
360 Posts |
"We have concluded that the damaged buffalo has now risen from the coin, and has decided to go back into nature where he belongs."
|
|
Pillar of the Community
United States
2624 Posts |
SPP-Ottawa: Please alert us when you publish,include where I can get a copy.
|
| |
Replies: 43 / Views: 12,470 |
First Page
Previous Page
Posted 01/28/2013 1:36 pm
