Why does hot water take longer to cool in a light kettle than in a dark one?

A kettle painted in dark shades absorbs energy faster than a kettle painted in light shades. At the same time, a dark teapot will give off heat faster than a light one. Examples can be given.
For example, take Antarctica. At the pole, the sun heats up very strongly. But why is it cold there? Because the snow is white. It reflects the sun’s rays, i.e. does not receive internal energy from the sun through radiation. Let’s take people, for example. Have you not noticed that, being in the sun without a headdress, people with a dark shade of hair will suffer headaches faster than blondes? This is also due to the fact that the head of brunettes heats up much faster than that of blondes because of the shade of the hair).