| http://www.w3.org/ns/prov#value | - Most of the bromine in the plastic is still there, and will continue to mobilize. so yellowing may recur in time, especially if the plastic is exposed to heat and UV. I do not have a way to stop that BUT since the problem is not really bromine or its mobility, but the fact that it reacts with atmospheric oxygen to stabilize at the surface as a brown stain, you might try rubbing the cleaned, dried pa
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