Abstract: An improved method of deacidifying books, imaged paper and other imaged materials having a cellulose base wherein, for a sufficient time to raise the pH of the materials, the materials are treated with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in a hydrofluorether carrier, alone, or in combination with a perfluorinated carrier. A surfactant is added.

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: An improved method of deacidifying books, imaged paper and other imaged materials having a cellulose base wherein, for a sufficient time to raise the pH of the materials, the materials are treated with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in a hydrofluorether carrier, alone, or in combination with a perfluorinated carrier. A surfactant is added.

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.

Abstract: A method and apparatus for deacidification of cellulosic materials such as the pages of books, magazines, newspapers, documents and the like are provided which ensures that substantially the entirety of each page is treated. The method includes placing the materials within a carrier such that the pages are free for exposure to the treating medium. The carrier is submerged in a vat preferably containing a dispersion of treating material including particles of an alkaline metal oxide, hydroxide or salt. The vat includes a support frame which supports the carrier and is slidably mounted on the vat such that the carrier and materials it holds may reciprocate in a generally horizontal direction. The reciprocation of the support frame causes the pages of a book, for example, to fan out, and the treating material in the medium thus comes into contact with each page of the book, magazine or other document.

Abstract: An improved method of deacidifying books, imaged paper and other imaged materials having a cellulose base wherein, for a sufficient time to raise the pH of the materials, the materials are treated with alkaline particles of a basic metal oxide, hydroxide or salt dispersed in an inert perflourinated carrier, preferably selected from the group consisting of perfluoropolyoxyether, perfluoromorpholine and combinations thereof. Perfluoropolyoxyether alkanoic acid is added as a surfactant. Alternatively, when perfluoromorpholine is the carrier of choice, the surfactant may instead be potassium fluoroalkyl carboxylate.