At a guess, only a plastic such as PTFE, poly-[tetrafluoroethylene] ('Teflon' is one form) can withstand the cleavage of its internal bondings by any combination of ultraviolet light, heat, pressure, oxidation and the like. Few plastics contain such a tough customer as fluorine, which, having formed a non-ionic bond with another element, almost never lets go for any reason this side of Armageddon.

So, don't hold your breath. It's not for no reason that most plastics are coloured for normal use.

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