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<p>[QUOTE=&quot;physics-fan3.14, post: 766431, member: 19165&quot;]That is a simple question with an incredibly complicated answer. There are important differences between artificial and natural toning, based upon how they formed. Different color patterns, different toning patterns, different ways that different series or years tone based on their typical storage methods.... the list goes on and on. Much reading and much experience are the key.... In the next day or two, I will try and post a thread I wrote a year or so ago on the NGC forums, about toning.[/QUOTE]</p><p><br /></p>

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