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<p>[QUOTE=&quot;GDJMSP, post: 1900835, member: 112&quot;]It&#039;s completely variable. It&#039;s not a question of the color as much as it is time, any color can mute luster to variable degrees. The most common toning there is, grey, is well known for making luster just go poof. Dark brown can do the same thing on some coins, but look at copper. Dark chocolate brown is the norm and yet the luster still shines through. And with black, there is none. </p><p><br /></p><p>But the bottom line is that when toning becomes so thick that light cannot pass through it and be reflected back, then there is no luster visible. I say visible because in many cases the luster is still there, under the toning, you just can&#039;t see it anymore. But dip the coin, remove the toning, and lo and behold the luster is there staring you in the face.[/QUOTE]</p><p><br /></p>

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