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<p>[QUOTE=&quot;physics-fan3.14, post: 3604642, member: 19165&quot;]Natural toning, as explained above, is a surface reaction between the metal and foreign contaminants. However, artificial toning such as the example shown in this thread really is adding a layer of something on the surface. Artificial toning usually isn&#039;t undergoing a reaction - it&#039;s often just adding some film on the surface exactly like paint.</p><p><br /></p><p><br /></p><p><br /></p><p>The cleaning is almost impossible to see in the pictures that ddddd posted. However, click the link to the Heritage auction and look at the full slab pictures. The obverse of the coin is *covered* in fine, parallel scratches across her face and into the left field. That is due to the cleaning.[/QUOTE]</p><p><br /></p>

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