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Red-coloured objects appear red because they reflect mostly red light. Thus, they must absorb most of the other colours of light. Since light carries energy, they are absorbing solar energy, which is, of course, why objects that are left in the sun get hot.

Objects that are coloured black absorb all visible frequencies (colours) of light, which makes them appear dark, and also means they will absorb the most solar energy and heat up fastest in the sun.

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