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<p>[QUOTE=&quot;Morgan, post: 63314, member: 3630&quot;]The reason I asked about the toneing on the set is I posess 3 different sets which show toning on the coins. Two of the sets show the toning as a radiating collor begining at the outside of the coin and muving in. Basically looks as if the paper or glue is causing it. The other looks like I would expect if the toning was due to air. In that set the whole coin is coloring evenly.</p><p><br /></p><p>This issue really intrests me for two reasons. First I am a research engineer by trade. Altough I do not know the specifics of toning or chemical discoloration of the oxide layer I am familiar with the common forms of oxidation found on steel and aluminum. </p><p>&nbsp;</p><p>The second reason this is of intrest is the added collectability of toned coins. If it is due to the glue than a good portion of the sets should exibit the same colors. If it was due to a storage issue, than I have a more unique set.</p><p>&nbsp;</p><p>As for the appeal of toning....&nbsp;&nbsp; I very much like the blue yellow and purple iradecent colrs I just wish I could afford to have the nickle slabed so that I could construct a disply case to show off the color better.[/QUOTE]</p><p><br /></p>

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