eli5 Why do colors fade on things left in the sun?
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When we colour things we use pigments. These pigments can often (not always) be broken down by UV light. The sun emits lots of UV light. The majority of it is filtered out by our atmosphere but enough still gets through that it can slowly damage the molecular structure of the pigments. Eventually the molecules break down altogether and that’s when colour fading or sun bleaching occurs.
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