"It started life as am old pad of drawing paper that was folded, tediously brushed with steel wool dissolved in vinegar, and even more tediously stitched together. My only regret is I should have weathered the edges of the pages a lot more."
I've run across mentions of the steel wool and vinegar technique being used to age solid wood, but I never considered using it for paper. In hindsight it makes perfect sense. It's just wood of another sort, after all.