This could easily be mistaken for interference in a thin film of oil on the water.
It is an interference effect but it is taking place in thin cloud near the sun.
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Zooming in on a bright corona shows fine structure in the cloud and how the corona breaks up into iridescence.
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The metallic colours in this display were very striking, but great care was needed because it was close to the sun.
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The outer fragment of corona at the lower edge of the cloud gives way to general iridescence.
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