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<p>[QUOTE=&quot;Mark Feld, post: 1356228, member: 11467&quot;]Whether you like it/agree with it or not, some forms/causes of &quot;tarnish&quot; are generally deemed to be natural, and others, not. For example, when a coin appears to have been exposed to heat and chemicals, it is considered to be artificially toned.</p><p><br /></p><p>And generally speaking, knowledgeable numismatists (including graders at the major grading companies) have a good understanding of how coins tend to tone, and do, indeed, know better than many others, &quot;what they&#039;re doing&quot;.</p><p><br /></p><p>&nbsp;Yes, in many or most cases it can be a matter of guesswork, but it can be highly educated guesswork, based on decades of experience.[/QUOTE]</p><p><br /></p>

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