[brian.austin]

Originally Posted by Tom Swaman

Dust, dirt, UV oxidation, rapid temperature changes or gradients, airborne greaseses, pollens, bacteria other microbiological organisms, chemical precipitation, other debris, contact with foreign surfaces and a whole lot more!!!!!

Tom

Funny that the 50 year old photo I have hanging in my office...that's moved dozens of times between a variety of environments and climates...seems to be doing just fine with a light dusting every once in a while.