Effects on Fiber Stability

Some of the following conclusions were drawn in an excellent review and current knowledge of the influence of pigments on the light stability of pigments [144]  

Many pigments, particularly organic yellow, orange, and red, have negative effects on the photostability of polypropylene. 

Many pigments, such as carbon black, phthalocyanine blue and green, and titanium dioxide, influence light stability favorably by screening, selective absorption of harmful radiation, and deactivation of polymer photo-excited species. 

Negative influences of pigments on polymer light stability are due to sensitization of singlet oxygen formation, initiation of polymer photooxidation by photo-exdted pigment chromophore formation of other photo-excited species with adverse effects on 

Pigment influences on polymer photostability are not completely understood. More work on underlying causes, especially with organic pigments, is needed. 

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