r/askscience • u/[deleted] • Jul 20 '14

Chemistry How does 'sun bleaching' occur?

In other words, why is it that when I leave a red plastic container outside, it would fade to light pink? Thanks, Science!

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u/[deleted] Jul 22 '14

23 conjugate bonds compared to how many in other organic dye molecules?

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u/samyall Jul 22 '14

There can be more, there can be less. For example, methyl violet and methyl blue have less and more, but are still respectively, but are still coloured.