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<p>[QUOTE=&quot;GDJMSP, post: 448657, member: 112&quot;]Know it for a fact ? Not in a scientific way no, based on experience I do.</p><p><br /></p><p>The last time we talked about this the thing that sparked the conversation was a question as to why Peace dollars don&#039;t tone like Morgans. I explained that if you look closely at the surface of the two coins you will see the differences and the why. The surface of a Peace dollar is much smoother than that of a Morgan. Those metal flow lines - /\/\/\/\ - are much smaller, they don&#039;t stand up as tall on a Peace as they do on a Morgan. And because there is more surface of the silver exposed to the air on a Morgan, the Morgan tones more readily.</p><p><br /></p><p>You can also see this when comparing a Morgan and a Peace of equal grade because the Morgan will have a different and more explosive luster than the Peace. Again, it is because the smoother surface of the Peace reflects light differently than a Morgan does.</p><p><br /></p><p>It is the metal flow lines that are the key, the higher they are the more readily the coin tones. Now that&#039;s the same kind of idea you were offering rlm, except you were thinking that the acid in the dip would roughen the surface thus exposing more metal to the air. But that&#039;s not what happens when a coin is dipped. When you dip a coin the metal flow lines are flattened out, filled in if you will, and that&#039;s why a dipped coin does not reflect light like an undipped coin. And to me that&#039;s the proof of the premise that a dipped coin will tone more slowly than an undipped one. Besides the fact that I&#039;ve watched it happen that way a thousand times or so.[/QUOTE]</p><p><br /></p>

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