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In addition to a reduced daily thermal cycling, another advantage of white is that it is reflecting all of the (visible) wavelengths of light, thus avoiding the longevity problems seen with red and black paint, which are absorbing the shorter, more energetic wavelengths (blue through UV) of light and eventually being degraded by their energies. Ever notice how the red on road signs is very quick to fade with extended exposure to sunlight compared with blue and white.
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