Bookkeeper Deacidification neutralizes harmful acids and greatly extends the lifespan of books and documents. Plus, it’s safe and clean. Bookkeeper deposits a non-toxic alkaline buffer into the paper that neutralizes harmful acids. The process does not require solvents or gases that can damage inks, adhesives, paper, or binding fabrics. And because Bookkeeper is solvent-free, no harmful chemical residues remain in the paper. There is no need for after-treatment off-gassing to remove odors or humidification to restore moisture to the paper. Bookkeeper is the safest, most effective means of deacidification. Paper treated with Bookkeeper has a life expectancy of at least three to five times longer than those documents that went untreated. That could make a difference in decades, perhaps centuries, for the lifespan of important documents, maps, and works of art.