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<p>[QUOTE=&quot;kanga, post: 478093, member: 9270&quot;]IMO the major contributors to NT are metal type and preservation methods.</p><p>&nbsp;</p><p>The more reactive a coin&#039;s metal is, the more likely they tone.</p><p>As I understand it the metals line up this way (from most to least reactive):</p><p>1. Copper</p><p>2. Silver</p><p>3. Nickel</p><p>4. Gold</p><p><u>Copper</u> mostly just goes brown.</p><p>It tones easily but generally not in the rainbow colors.</p><p><u>Silver</u> is quite reactive too, but here the toning products are often in colors that appeal to many collectors.</p><p><u>Nickel</u> doesn&#039;t tone that well. I suspect the colors you see are a result of the copper in the alloy.</p><p><u>Gold</u> is <i>relatively</i> inert. I&#039;ve never seen significant toning on a gold coin, especially not rainbow.</p><p>&nbsp;</p><p>Preservation does two main things for you.</p><p>- Mechanical protection (dents, dings, scratches, etc.)</p><p>- Chemical protection; it attempts to preserve the state of the surfaces of coins. If you get a rainbow toned coin and don&#039;t preserve it adequately, you end up with an ordinary toned coin.[/QUOTE]</p><p><br /></p>

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