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...breakdown of materials by exposure to light, especially UV

Photodegradation is the process by which materials are broken down or degraded by exposure to light, particularly ultraviolet (UV) radiation. In the context of hair, photodegradation can lead to the weakening of hair fibers, loss of color, and overall damage due to prolonged sun exposure. This process involves the absorption of light energy, which can cause chemical bonds within the material to break, leading to structural and compositional changes.