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<p>[QUOTE=&quot;-jeffB, post: 1489134, member: 27832&quot;]No, I don&#039;t think so. Not unless it&#039;s progressed way past &quot;toning&quot; to &quot;deep corrosion&quot;.</p><p><br /></p><p>Actually, I suppose if you cut a coin in half with diagonal cutters, you might &quot;see the toned layer&quot; -- because what was formerly the surface is stretched and dragged into the cut. I&#039;m not going to try it.</p><p><br /></p><p>But for colored toning (as opposed to black), the thickness of the layer is in the range of one wavelength of visible light. You can analyze it with an electron microscope, but you aren&#039;t going to be able to see it in cross-section with an optical microscope, never mind the naked eye.</p><p><br /></p><p>In contrast, the flow lines that produce luster are clearly visible with an optical microscope. So they <i>must</i> be significantly larger than the toning layer -- and it makes sense that one could remove the toning layer without completely disrupting the luster.[/QUOTE]</p><p><br /></p>

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