Photodarkening is a phenomenon that occurs in certain materials, particularly in glasses and polymers, where exposure to light results in a change in color or opacity, leading to a darker appearance. This effect is often observed in optical glasses and some types of polymers that contain specific organic dyes or pigments. The mechanism behind photodarkening typically involves the absorption of energy from light, which can trigger chemical reactions, such as the formation of new molecular structures or the aggregation of existing ones.
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