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<p>[QUOTE=&quot;NorthKorea, post: 1557506, member: 29643&quot;]Is it possible that you&#039;re wrong on this?</p><p><br /></p><p>I mean, I think a lot of it has to do with orientation, as opposed to simply adherence. If you imagine a piece of suede, rubbing in one direction yields a darker color than rubbing in the other. Similarly, opals will show play of color in certain orientations better than others.</p><p><br /></p><p>I think toning oxidation might work in a similar way to how the opals work. The angles created by the formation of Ag2-S on the surfaces of the coins diffract light at different directions. When you have the ridges from striation /\/\/\ , your eye receives light at different directions/wavelengths/velocities/whatnot, which results in different colors. When those ridges change /U\|\|\/|/|U--U\/ , light reaches your eye at less defined angles, which muddles the colors together. Even if the ridges were the same &quot;height,&quot; you would still end up with less defined (darker saturated) colors.</p><p><br /></p><p>At least, that&#039;s what I think is happening. I might be wrong. It&#039;s happened before. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie8" alt=":D" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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