I can vouch for 1-year, still white, but the principle speaks to your question i.e., Bromine was used as fire-retardant, UV unbonds the Bromine and draws it to the surface of the plastic and whitening bonds the Bromine to the hydrogen peroxide thereby removing it from the plastic altogether.
Bromine was only fire-retardant and does not contribute to the strength of the plastic so removing it should not detract from plastic strength.
Also, once the Bromine is gone, thé plastic should bot again yellow whether in sunlight or not.
But, other things apart from UV can harm plastic so still best to display responsibly.
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Originally Posted by justprime
Has anyone seen if the plastic will return to it yellowing state after a long time period? Even if it's kept out of sunlight? What's long term effects?
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