Bookkeeper is a safe, efficient and environmentally friendly way to neutralize acidic papers. The neutralizing agent, magnesium oxide, is carried into the paper by the liquid carrier, perfluoroalkane, and the dispersant. This neutralizing agent does not react adversely with moisture and therefore it won’t block the spray nozzle. The liquid carrier is a non-solvent, so it won’t dissolve inks or colors, nor will it loosen labels or bindings. It is freon-free, odor-free, non-toxic and non-flammable. One 16 oz. aerosol can treats approximately 20-25 sq. ft. of paper surface, the 38 oz. spray bottle about 50-60 sq. ft