If so, are they out and about, with cracked or folded pages where sunlight shines on them ?
Most people keep such things in a bookcase, in a box in a closet, in an attic, in a basement, maybe in a desk, away from sunlight; if they keep them at all.
Because of all of this talk, I decided to look at some old yearbooks and no, the ink hasn't changed over the years; especially in just one part of a message.
This accuser's story smells to high heaven and in so many different ways!
It could be sitting on a shelf with a slight bend that creates a gap. All it would take is the pages not being stacked together in a perfect slab. Books that have been handled are sometimes like that.