It depends on the plastic. From what I can determine, when it comes to nylon "alloys", black is probably the best color for UV resistance. Here's one source, but there are others.
http://www.sdplastics.com/ultravioletresistance.html
"Nylon. Black pigmented grades have better UV stability."
I would also speculate that it depends on whether the color is a surface treatment or actually mixed into the polymer itself.
http://www.sdplastics.com/ultravioletresistance.html
"Nylon. Black pigmented grades have better UV stability."
I would also speculate that it depends on whether the color is a surface treatment or actually mixed into the polymer itself.
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