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What caused this colorful rainbow?
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<p>[QUOTE="-jeffB, post: 8091040, member: 27832"]One of the clearest shots of interference fringes I've seen here. That's from a thin transparent layer of <i>something</i> with varying thickness. Assuming there isn't actual plastic wrap over the coin, yeah, I'll go with lacquer, or maybe even some sort of polymer glue.</p><p><br /></p><p>If I had it in hand, I'd be tempted to haul out a couple of polarizers, put one on a light and one in front of my lens, and see what happens as I turn them. Wouldn't contribute any knowledge of what's on the coin or what to do about it, but it might be a pretty trippy visual.[/QUOTE]</p><p><br /></p>
[QUOTE="-jeffB, post: 8091040, member: 27832"]One of the clearest shots of interference fringes I've seen here. That's from a thin transparent layer of [I]something[/I] with varying thickness. Assuming there isn't actual plastic wrap over the coin, yeah, I'll go with lacquer, or maybe even some sort of polymer glue. If I had it in hand, I'd be tempted to haul out a couple of polarizers, put one on a light and one in front of my lens, and see what happens as I turn them. Wouldn't contribute any knowledge of what's on the coin or what to do about it, but it might be a pretty trippy visual.[/QUOTE]
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What caused this colorful rainbow?
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