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<p>[QUOTE=&quot;susanlynn9, post: 31587, member: 1258&quot;]It&#039;s hard to say if the toning is artificial. Even experts sometimes have difficulty identifying whether a coin is artificially or naturally toned. Also, there is a fine line between what is considered artificial and what is considered natural. </p><p><br /></p><p>Certain types of holders, albums, etc. will react with the metal and cause a rainbow toning. If someone knows that putting a coin in a certain album in a certain environment will cause toning, does that mean that it&#039;s artificially toned if he does this? There are a wide range of opinions on that. </p><p><br /></p><p>There are ways to tone a coin with electricity, heat, moisture, etc. If a coin is inadvertantly left in a holder and the conditions are met that cause the toning, why is this different than if the coin is deliberately put into the same conditions? This has been an ongoing debate.</p><p><br /></p><p>As far as what you should be looking for for your collection - that&#039;s up to you. There are people who collect AT coins. There are people who collect NT coins. There are people who only prefer blast white coins. The choice is yours. I have seen very deep rainbow toning on old proof sets that were still sealed in their original cellophane. The toning could have appeared artificial except that the cellophane was still intact.</p><p><br /></p><p>As I understand it, even the top tier grading companies can&#039;t always tell when a coin is AT. Although this particular seller is selling quite a number of toned coins, that doesn&#039;t necessarily mean that he is artificially toning them. Maybe they have all been stored in the same album over the years and all have toned naturally.</p><p><br /></p><p>A tough question.[/QUOTE]</p><p><br /></p>

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