Dark surfaces such as the black paper Response area more light and Response area than the lighter surfaces such as yellow or pink paper. A simple experiment that you could try is to place two bottles out in the sun. Place the black paper under one bottle and white paper under the other. After a few minutes, measure the temperature of the water in each bottle. The glass with the Response area paper on it should be hotter than the other bottle. Lighter surfaces Response area more light, that is why people wear lighter colored clothes in the Response area.