Abstract: A method and apparatus are provided for deacidifying cellulose based materials, especially books, magazines, and other bound or folded cellulose materials having a spine. The method includes contacting the materials with a treating medium and producing relative movement at a predetermined velocity between the materials and the treating medium in a direction generally parallel to the spine of the materials and, preferably simultaneously, directing the treating medium by means of a spray toward the materials in a direction generally perpendicular to the spine of the material for a period of time effective for the treating medium to contact substantially all of the material. Following treatment, any excess treating medium is removed from the material and directing any such removed treating medium to a holding tank for reuse later. The movement in a parallel direction is achieved by reciprocating the materials through a tank filled with treating medium.

Abstract: A method for temporarily revealing the presence of a watermark on cellulose-based materials. The method comprises applying one of a perfluorocarbon ard hydrofluorocarbon to at least a portion of the cellulose-based material. The method also provides applying a solution containing both perfluorocarbon and hydrofluorocarbon to the cellulose-based material to vary the rate of evaporation of the solution.

Abstract: A method and apparatus are provided for deacidifying cellulose based materials, especially books, magazines, and other bound or folded cellulose materials having a spine. The method includes contacting the materials with a treating medium and producing relative movement at a predetermined velocity between the materials and the treating medium in a direction generally parallel to the spine of the materials and, preferably simultaneously, directing the treating medium by means of a spray toward the materials in a direction generally perpendicular to the spine of the material for a period of time effective for the treating medium to contact substantially all of the material. Following treatment, any excess treating medium is removed from the material and directing any such removed treating medium to a holding tank for reuse later. The movement in a parallel direction is achieved by reciprocating the materials through a tank filled with treating medium.

Abstract: A method and apparatus are provided for deacidifying cellulose based materials, especially books, magazines, and other bound or folded cellulose materials having a spine. The method includes contacting the materials with a treating medium and producing relative movement at a predetermined velocity between the materials and the treating medium in a direction generally parallel to the spine of the materials and, preferably simultaneously, directing the treating medium by means of a spray toward the materials in a direction generally perpendicular to the spine of the material for a period of time effective for the treating medium to contact substantially all of the material. Following treatment, any excess treating medium is removed from the material and directing any such removed treating medium to a holding tank for reuse later. The movement in a parallel direction is achieved by reciprocating the materials through a tank filled with treating medium.