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<p>[QUOTE=&quot;GDJMSP, post: 2997773, member: 112&quot;]Answer to your question - yes. </p><p><br /></p><p>But, for practical purposes, right there&#039;s where you need to stop your question. I&#039;m saying that because in the end it doesn&#039;t matter if it&#039;s this oxide or that oxide or some other -ide, or -ate, or, or, or. The only thing that matters is that it is all, from beginning to end, just another stage of the toning as it progresses.</p><p><br /></p><p>Now if your interest is in the actual chemistry and of how one compound can change into another compound, well then I can understand your question continuing on into the various chemical compounds that may be formed. And that this or that one may cause reds, or blues, or browns, or whatever other color.</p><p><br /></p><p>But for the purposes of coin collecting - what difference does it make what the chemical compounds are ? As collectors all we need to know is that toning occurs, and that with copper that red goes from red to brown, and along the way it may also be any of several other and different colors. And we need to know that air is the enemy of coins - and that&#039;s really all we need to know - as coin collectors. And I say that because that tells what we need to do, or not do, as we store our coins. If you want toning - then leave a coin exposed to the air. If you don&#039;t want toning - them minimize exposure to the air as much as possible.</p><p><br /></p><p>Do you understand what I&#039;m trying to say ? It doesn&#039;t matter if it&#039;s this compound or that compound that is causing the toning - all that matters is that it is happening. You can&#039;t stop just this or that particular compound from forming - you have to stop all of them from forming. Or none of them of course.[/QUOTE]</p><p><br /></p>

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