When all visible wavelengths enter the eye simultaneously, the color white is perceived. Black is the absence of any light. An object's color in the sun depends on which wavelengths it absorbs and, therefore, which are reflected away from the object. A shirt that appears red absorbs the shorter wavelengths and reflects longer ones . The reverse is true for a blue shirt.
Absorbed radiation is converted into heat, making the darker shirt warmer to wear.
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