Any truth to the practice of BLACK painted parts dissipating heat better?

Right! Not disagreeing or trying to dissuade anyone of their theories, but can anyone explain this; Try painting your foam core front door on your house facing south white or black.... the white will reflect the light and stay cool, the black with absorb heat and literally melt the foam and the glue will run right out of it, especially if you are in a warmer climate!! So, black can only dissipate heat in the dark???
/confoosed in Ohio lol

Easy to explain. Heat from the sun arrives in radiant form - with little convection, the heat cannot be rejected. Black will absorb and radiate away more radiative heat than white will.