Saw this on the stamps are art website about the effects of light on plastics.
http://www.stampsrart.com/plasticin...lastic1.htmlI know not many of us will put our stamps through one month of direct sunlight but it is interesting how the light affected the different plastics.
Though not scientific the experiment reminds me of a company near Chicago called UL Labs. UL melts stuff for safety.
Posted 08/30/2012 12:50 pm
