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<p>[QUOTE=&quot;TypeCoin971793, post: 2426894, member: 78244&quot;]Yes, I get all of the physics behind thin film interference where it applies to silver coins. However, for it to work, the metal surface needs to reflect the light through the patina. When the metal wears and the luster disappears, the light can&#039;t reflect through the thicker patinas. That is why circulated silver coins tone grey with little color. However, when a coin is cleaned or dipped, the patina layer is thinned substantially and the metal surface becomes more reflective, so the patina can produce colors. A perfect example is this coin:</p><p>[ATTACH=full]503799[/ATTACH]</p><p><br /></p><p>Had the half dime, half dollar (both examples), and my dollar been fully lustrous, the entire surface would be covered in colorful toning, likely not the terminal states of the color progression. You are confusing the glossy, lustrous black of the late-state color progression with the dull grey of the toning on circulated silver coins.</p><p><br /></p><p>Again, notice how the color abruptly disappears when the luster ends.[/QUOTE]</p><p><br /></p>

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