Capable of being chemically broken down by light: photodegradable plastic.
Clothes fade in the sun due to a process called photodegradation, where ultraviolet (UV) rays break down the dye molecules in the fabric. As a result, the colors lose their vibrancy and appear washed out over time. Exposure to sunlight can accelerate this process, especially for fabrics that are not designed to be UV-resistant.
I heard that milk in an opaque carton will spoil slowly, whereas milk in a translucent plastic jug (as most is) spoils more quickly. Supposedly, the light spoils the milk. Sounded good at first, then I thought about it a little bit. The milk is rarely exposed to light, at least once I buy it. The light in the fridge turns off when I close the door. So how can a few moments' of exposure make that big of a difference? Unless it's the exposure at the store that's supposed to make the difference? I'd like to see other people's answers, but my first guess is no.