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The only way I can come up with a test, when the counterfeiters learn how to add metal and the etch the coin to shape. Is well there is a weld to add metal.
Anodizing with aluminom shows any weld that was added to the aluminom, may work the same way when reviewing such corroded coins. The coin is already at a damage state for a specimen. Anodizing would probably clean the coin with a lot of harshness to the coin. But color can be duplicated and restored, and easily more so when using the same harsh method of cleaning the coin. And could be considered conserving the corroded coin before being slabed. I wish the companies actually took the time to conserve a coin before stabbing a dirty old coin. As they know in time on copper the dirt will turn to a green, and thus that company down the road will have many ugly coins that grade lower then when they did grade. Every coin that's gets slabed should be babied and conserved, as to take pride in what they do for the coin and it's value, but more so for their reputation to hold nice coins and still be nice coins decades down the road. If such a practice started then these new forgeries could most likely be stopped. Once they get the process down the only other way I can think the inside corners or valleys in the coin, making such sharp turn down and back up will not be such a sharp turn but have a bigger radius for that sharp corner detail.
Anodizing with aluminom shows any weld that was added to the aluminom, may work the same way when reviewing such corroded coins. The coin is already at a damage state for a specimen. Anodizing would probably clean the coin with a lot of harshness to the coin. But color can be duplicated and restored, and easily more so when using the same harsh method of cleaning the coin. And could be considered conserving the corroded coin before being slabed. I wish the companies actually took the time to conserve a coin before stabbing a dirty old coin. As they know in time on copper the dirt will turn to a green, and thus that company down the road will have many ugly coins that grade lower then when they did grade. Every coin that's gets slabed should be babied and conserved, as to take pride in what they do for the coin and it's value, but more so for their reputation to hold nice coins and still be nice coins decades down the road. If such a practice started then these new forgeries could most likely be stopped. Once they get the process down the only other way I can think the inside corners or valleys in the coin, making such sharp turn down and back up will not be such a sharp turn but have a bigger radius for that sharp corner detail.
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