re: protecting autographs question...

humidity, light, and temperature variations all are very rough on the ink. Also, a key is simply using a high quality permanent ink pen to begin with. If you are an autograph seeker never carry ballpoint pins, but instead always use Sharpie type pens.

Also, for some autographs on paper/photos even the way you frame them can make a difference. Certain surfaces are more reactive and carry different PH levels.