Paper rots, even in books, and preserving documents has long bedeviled librarians. Now “conservationists are buzzing about a new technique developed by Ink Cor, a research group concerned with neutralizing the wasting effect of corrosive inks without damaging the underlying paper. The group recently completed a prototype treatment using halide salts, a colorless antioxidant that can prolong the life span of paper containing corrosive ink by a factor of 10.”