The absense of heat is cold and that makes me think. If a black and white object of the same material was at absolute zero(-478 degrees F), which would heat faster? Same material, same rate. They would both have the same heat capacity and therefore use the same energy to retain heat and would actually cool slightly by using this energy. But the black paint may have a higher or lower heat capacity depending on what is in it that makes it black as opposed to white. I would say that it really depends on the contents of the paints used.
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