Information recording medium and information recording method suitable for security purposes

摘要

The present invention has an object to provide a information recording medium and an information recording method which permit confirmation of the same photo-portrait image as a photo-portrait image made with coloring ink by irradiating ultraviolet rays or infrared rays although the image cannot be confirmed within the visible region because the image is colorless and transparent within this region. The same photo-portrait image as the photo-portrait image is recorded with ultraviolet ink or infrared ink which emits fluorescence by irradiating ultraviolet rays or infrared rays on a portion other than the recording portion of the photo-portrait image made with the coloring ink on the surface of a substrate.