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1937 Australian Proof Crown ANA Certification service.
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<p>[QUOTE="Bob Evancho, post: 3568778, member: 84595"]Good question. I followed instructions I was given and placed the coin in the bottom of a beaker, then filled with acetone and swished the acetone without moving the coin. I did this 5 times with fresh acetone, let it air dry each time and removed all the PVC oils. I studied this under a microscope and noticed the discoloration to the copper in the sterling silver. There is no way to resolve that issue according to a chemical engineer friend of mine. There is no further PVC on the coin but a slight discoloration. I don't think NGC or PCGS could do better to bring the silver color back. It's still a nice coin and will be used for educational purposes. And still a rare coin.[/QUOTE]</p><p><br /></p>
[QUOTE="Bob Evancho, post: 3568778, member: 84595"]Good question. I followed instructions I was given and placed the coin in the bottom of a beaker, then filled with acetone and swished the acetone without moving the coin. I did this 5 times with fresh acetone, let it air dry each time and removed all the PVC oils. I studied this under a microscope and noticed the discoloration to the copper in the sterling silver. There is no way to resolve that issue according to a chemical engineer friend of mine. There is no further PVC on the coin but a slight discoloration. I don't think NGC or PCGS could do better to bring the silver color back. It's still a nice coin and will be used for educational purposes. And still a rare coin.[/QUOTE]
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