Touring - Do Colored Panniers Fade?

I've seen seat rackpacks on fellow club members with faded blue and red material. Is the material on panniers a different type that do not fade? I would like to buy some front panniers and use them for weekend trips and if I like it, move the panniers to the front and buy some larger panniers for the rear. It may be a couple of years, so will the color change be noticeable?

My Ortliebs haven't faded at all in two/three years. I would expect woven nylon to fade a bit though.

Thanks, I was leaning towards Ortliebs. I would get frustrated with trying to remember what was in the different pockets of the Arkels and I wanted the panniers to be waterproof.

Ortliebs don't fade due to the proofing of the material they use ,which by the way is very tough. The classic Caradyce black heavy cotton canvas does fade but has its own appeal.

Sunlight has a bleaching effect on fabrics, so expect panniers that are exposed to the sun to fade eventually.

According to http://www.answerbag.com/q_view.php/11735:

"Sunlight catalyses a reaction where water present in all fabrics reacts with atmospheric oxygen to make hydrogen peroxide, which is a bleaching agent. The UV light in sunlight is about a hundred times more effective at doing this than artificial light, but fabrics will fade even in artificial light eventually."

I bought my blue, Cannondale panniers in 1989. 16 years exposure to sunshine, rain, dirt, and sweat have caused them to fade beautifully! They certainly have character...