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<p>[QUOTE="Colonialjohn, post: 4403317, member: 57741"]See this recent article published in the Newman Numismatic Portal. Check out the key reference in the paper and it explains at least for Zacatecas how silver was made from ore to ingots. Its important and it answers WHY so many Mexican coins come back from the TPG's as erroneously called CLEANED due to their non-homogenous surfaces IMO. I would like to expand this work to more numerous examples for verification but the cost of doing this one coin was $200. Currently retired and do not have access to SEM/EDS.</p><p><br /></p><p><br /></p><p><a href="https://nnp.wustl.edu/library/book/579875?fbclid=IwAR2di2DVNBZr59jHLgNMGkwjCXtA5eJU9DJDDO3lX5TkWdk3XAzEW_e-j0M" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://nnp.wustl.edu/library/book/579875?fbclid=IwAR2di2DVNBZr59jHLgNMGkwjCXtA5eJU9DJDDO3lX5TkWdk3XAzEW_e-j0M" rel="nofollow">https://nnp.wustl.edu/library/book/579875?fbclid=IwAR2di2DVNBZr59jHLgNMGkwjCXtA5eJU9DJDDO3lX5TkWdk3XAzEW_e-j0M</a></p><p><br /></p><p>John Lorenzo</p><p>Numismatist</p><p>United States[/QUOTE]</p><p><br /></p>
[QUOTE="Colonialjohn, post: 4403317, member: 57741"]See this recent article published in the Newman Numismatic Portal. Check out the key reference in the paper and it explains at least for Zacatecas how silver was made from ore to ingots. Its important and it answers WHY so many Mexican coins come back from the TPG's as erroneously called CLEANED due to their non-homogenous surfaces IMO. I would like to expand this work to more numerous examples for verification but the cost of doing this one coin was $200. Currently retired and do not have access to SEM/EDS. [URL]https://nnp.wustl.edu/library/book/579875?fbclid=IwAR2di2DVNBZr59jHLgNMGkwjCXtA5eJU9DJDDO3lX5TkWdk3XAzEW_e-j0M[/URL] John Lorenzo Numismatist United States[/QUOTE]
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