Preservation Technologies’ Bookkeeper Deacidification Process deposits a safe, non-toxic alkaline buffer into the paper that neutralizes harmful acids. The process does not require any 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 available.