In strong sunlight, the skin produces extra melanin to protect it from harmful ultraviolet rays. This melanin spreads through the epidermis, in the form of tiny black grains. Eventually skin turns darker, producing a tan. Every skin colour turns darker with exposure to sunlight.
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In strong sunlight, the skin produces extra melanin to protect it from harmful ultraviolet rays. This melanin spreads through the epidermis, in the form of tiny black grains. Eventually skin turns darker, producing a tan. Every skin colour turns darker with exposure to sunlight.