Quickie
Colonel
One thing we know is that the black paint were applied after the base paint:
I'm still more convinced that it's to keep a clean look of the ship and avoid hard to clean stains.
In this pic you see that the fore mast is closer to the funnel than the rear but only the rear mast is painted black. Also the sensors on the mast tip is not painted where as there are places higher that are. This suggests that the temperature at that point is tolerable and the reason for the black paint is more for appearance.
It could be a type of heat tolerant paint that happens to be black in appearance. Black body is both a good absorber and emitter which is not good for low heat signature, but this should not be an issue if the heat tolerant paint is also a very bad heat conductor.
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