Mitsubishi Hitec Paper Flensburg Gmbh

Karsten S&uuml;ssenbach

Gerhard Stork

Wolfgang Wagner

Erich Kranz

Michael Reimann

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/m , the method comprising the step of wetting the surface of the layer opposite the recording layer with an alkaline substance.

Growing community of inventors

Flensburg, Germany

Karsten Süssenbach

Growing community of inventors

Flensburg, Germany

Karsten S&uuml;ssenbach

Karsten Süssenbach