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<p>[QUOTE=&quot;Lehigh96, post: 3238320, member: 15309&quot;]Rainbow toned coins form when the coin comes in direct contact with a sulfur laden toning source.&nbsp; For example, bag toning on Morgans, or album toning on 20th Century coinage.&nbsp; Once you remove the coin from its toning source, the existing toning provides a barrier to inhibit further toning from hydrogen sulfide gas in the atmosphere. </p><p><br /></p><p>The only proof I have is that none of my toned coins have ever developed more toning.&nbsp; And I do have a degree in Materials Science Enigineering but I only worked in the enigineering for a year, so my recollection of thermodynamics, diffusion, and principled or corrosion is a little hazy![/QUOTE]</p><p><br /></p>

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