When light comes to us from the sun, we call it \”white light\” because it contains all the visible light spectrum colors available, those being red, orange, yellow, green, blue indigo, and violet. P All these colors combine to make white light. P We know this because we can take a prism and shine white light through it, and it will break the light up into the individual colors that make it up. Objects that are black are absent of any of the visible light spectrum colors.
P So when those objects are radiated upon by light, none of the individual wave lengths are reflected. P They are all absorbed, which translates to increased heat and temperature. Conversely, items that are white or light colored, reflect most, if not all the wavelengths contained in the visible light spectrum. P So they are reflected away from that object, which translates into same heat, same temperature. So when you go outside, if it is hot, wear light-colored clothing; it will absorb less of the sun\’s radiation.
P If it is cold, wear dark-colored clothing; it will absorb more of the sun\’s radiation. Of course, this becomes complicated and changes if wind and tightness or looseness of clothing are factors. Just think of all the white animals with fluffy fur or feathers in the Arctic and Antarctic.
Dark colors absorb a lot more heat than lighter ones because they absorb more light energy. In fact, the closer to black a color is, the more heat it absorbs from light sources.
The key is that colors do not absorb different amounts of heat, only heat from light. Dark and light colored clothes coming out of a dryer will be the same temperature. However, because light clothes reflect more light when a person is outside, the accompanying heat from the sun is reflected as well. Since dark clothes reflect little solar light, they reflect little solar heat and are hotter as a result.