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1937 Australian Proof Crown ANA Certification service.
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<p>[QUOTE="Oldhoopster, post: 3636157, member: 84179"]I think your confusing cleaning a coin to remove toning (where the metal on the surface has reacted to form sulfides or oxides) and using a solvent to remove organic contaminants</p><p><br /></p><p>Acetone only removes organic contaminants that are adhered to the surface of the coin. It's not considered harmful cleaning since it doesn't affect the coins surface and will not affect the value (assuming the toning of the coin matches the surface under the organic material). In some instances such as PVC plasticizer, failure to use a solvent like acetone will result in permanent damage to the coin.</p><p><br /></p><p>Hope this clarifies things[/QUOTE]</p><p><br /></p>
[QUOTE="Oldhoopster, post: 3636157, member: 84179"]I think your confusing cleaning a coin to remove toning (where the metal on the surface has reacted to form sulfides or oxides) and using a solvent to remove organic contaminants Acetone only removes organic contaminants that are adhered to the surface of the coin. It's not considered harmful cleaning since it doesn't affect the coins surface and will not affect the value (assuming the toning of the coin matches the surface under the organic material). In some instances such as PVC plasticizer, failure to use a solvent like acetone will result in permanent damage to the coin. Hope this clarifies things[/QUOTE]
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