05-11-2011, 04:24 PM
It is the double whammy of UV & Acid (VOG) creating degradation & oxidative reactions that break down the carbon-hydrogen bonds! Acid is the best if you want oxidations!
Link to UV degradation of hydrocarbon polymers:
http://en.wikipedia.org/wiki/UV_degradation
ETA: The pens? I have noticed they stop earlier, too... but thought that they were made cheaper in the last 5 years....
Link to UV degradation of hydrocarbon polymers:
http://en.wikipedia.org/wiki/UV_degradation
ETA: The pens? I have noticed they stop earlier, too... but thought that they were made cheaper in the last 5 years....