那4種顏色吸熱同散熱最快

black > green > yellow > red

black can absorb all light(so that you cannot see any colour), so it is the fastest absorb rate.
the rests can absorb most of the light except the colour you are seeing(the material reflect that colour to your eye, rather than absorb it ).so by comparing the energy that carried by the colour, we can find out which material has faster absorb rate.

I think you can find out the energy of colour by yourself, isn't it true?