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I can't find any literature that indicates white is any better or worse than black paint. All non-specialty paints seem to be around the same emissivity and are 'black' in the IR spectrum (black in this context should not be associated with visible colour).
There are some high and low emissivity coatings out there but I'd suspect this is not used on amateur gear. My guess is that colour choice is down to aesthetics (marketing).
If emissivity is really a concern, the lowest emitters are polished metallic surfaces and metallised films. Not too far behind are aluminised paints.
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