Abstract: Recording paper includes a stock sizing and/or surface preparation, a front side for receiving recordings and a reverse side configured differently from the front. The reverse exhibits excellent printability coupled with improved drying of printing inks when using offset printing inks that contain functional pigments and in particular magnetizable particles, while preventing the printable ink and the functional pigments, in particular the magnetizable particles, from penetrating too deeply into the paper.

Abstract: A method of checking the authenticity of a heat-sensitive recording material having a carrier paper with a recording layer which is arranged on one face and which contains colorant formers and organic colorant acceptors that react with one another when heated; and a security feature provided as a water-soluble dye which fluoresces under UV radiation, the dye being applied without binder in a pattern, invisible under daylight, to a surface of a face of the carrier paper opposite the face provided with the recording layer, so that the entire surface has the pattern, the water-soluble dye being applied at a mass per unit area between 0.01 and 40 mg/m2, the method comprising the step of wetting the surface of the layer opposite the recording layer with an alkaline substance.

Abstract: The invention relates to recording paper comprising a stock sizing and/or surface preparation, whose front is designed for receiving drawings and whose reverse is configured differently from said front. The reverse exhibits excellent printability coupled with improved drying of printing inks when using offset printing inks that contain functional pigments and in particular magnetizable particles, whilst preventing the printing ink and the functional pigments, in particular the magnetizable particles, from penetrating too deeply into the paper.

Abstract: A heat-sensitive recording sheet having a substrate with a heat-sensitive recording layer which contains color formers and color acceptors which react with one another under the action of heat. In order to permit the detection of counterfeited documents without the additional use of aids such as UV lamps or chemicals, present in the heat-sensitive recording layer, as a security element, are pressure-sensitive microcapsules which contain one or more color formers in a solvent. The color formers react with the color acceptors, forming a color, after destruction of the microcapsules.