How does UV exposure typically affect hair color?

UV exposure typically affects hair color primarily by causing fading and damage, which is why this choice is the most accurate. When hair is exposed to ultraviolet (UV) rays from the sun, the pigments in the hair can break down, leading to a loss of color intensity. This fading can be particularly noticeable in color-treated hair, where the dye molecules can be more vulnerable to degradation from UV light.

Additionally, UV radiation can weaken the hair's cuticle, making it more prone to damage, dryness, and brittleness. This structural damage can further reduce the hair’s overall brightness and vitality, giving it a dull or lifeless appearance. Therefore, understanding UV exposure's impact on hair is crucial for maintaining healthy hair color and overall hair health.