What does color have to do with heat absorption?
It’s not exactly about heat, it’s about radiation. What you see is not the color of the things, it’s the radiation (in the visible range) reflected by the things. When you see a red thing, it means that from all the visible radiation hitting that thing, only the red (or all the components that make that particular shade of red) frequency is being reflected. Rarely it’s only one frequency. Visible light is energy and the more you absorb of it, the more your temperature raises. Most lights around us are too weak to make a difference, we get more heat from electric current dissipation than light. But light is still part of the energy that reaches us. If you wear something that reflects a lot of energy in all visible frequencies (pure white), you don’t absorb that energy anymore. Or use pitch black to absorb as much as you can. If you make a solar water heater don’t paint it white or shinny. Make it dark and opaque to get the most of the sun’s energy.
