Just a thought for further investigations - the coin is unique based on its conventional mint-mark to the right instead of the larger mint-marks above the dome. We note on page 36 the following statement: "After testing by NGC the alloy has been revealed to be 50%Ag, 45% Cu & 6% Mn as compared to the mint standard for WWII issues of 35%Ag, 56%Cu and 9%Mn. As correctly indicated environmental wear can alter these surface XRF readings. As with most analysis David Lange probably not being well versed in Material Analysis fails to realize that a SEM monograph of the coin's surface along with the assay (i.e., the EDS part of the SEM/EDS analysis) may reveal its authenticity. What this Micrograph looks at is the arrangement of these metal ions at the surface since obviously this coin can not be cut or dug into due to its unique and monetary value. If the arrangement of these metallic ions (Ag, Mn and Cu and BTW the other metals in this alloy in trace) is SIMILAR to other wartime nickels then the authenticity is heighten or possibly even confirmed as a freak anomaly. In general particular with modern U.S. Mint manufacturing techniques we should not expect much deviation of the metal ions arrangement with one another or simpler terms every standard production process will generally have the same metallic ion configurations at the surface. Try SEM Microgrpahs David Lange, Kevin Flynn and William Gibbs. Normally if a coin has been foiled with or remelted these signs would also be picked up in the SEM Microgrpah. Go beyond the XRF assay! I do realize Daivd Lange this is about as far NGC & probably PCGS have gone today with Material Analysis is simplistic XRF surface assays. Take it to the next level!
See Craddock page 184 on one value of SEM Micrographs.
https://books.google.com/books?id=x...raph&f=falseLook for my new book on Material Analysis and Contemporary Circulating Counterfeits later this year via
Amazon Books.
See some of current XRF work in this numismatic best seller.
http://www.amazon.com/Counterfeit-P...glnkc3605-20John Lorenzo
Numismatist
United States
Posted 04/29/2016 2:37 pm
