I would like to know what optical phenomena could create such a "rainbow" effect in a factory automotive finish. There were high cirrus clouds, No rain, And the sun looked to be fairly low on the horizon. The car in question is very highly maintained. So scratches or haze in the finish are nonexistent. The finish is highly polished and very smooth. Also when the owner turned to look at the sky the arc wasn't visible. This event took place in England so it was at a high latitude. Just curious really. link to photo. http://www.z4-forum.com/forum/viewtopic.php?f=2&t=42958
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