| 摘要 |
PURPOSE:To ensure the confidentality of recording information by a method wherein a recorded part formed by a colorless recording agent made of an organic substance not having light absorption characteristics for a visible region light but for an ultraviolet reglon is formed on the surface of a substrate containing a fluorescent material, and the recorded part is made visible by emitting an ultraviolet light to the recorded part. CONSTITUTION:A recording material 2 made of a substrate, such as a transparent plastic film and paper, contains a fluorescent material 1 totally or on the surface thereof. A recorded part 4 is formed by a recording agent 3 using a brush, pen, or the like. The recording agent 3 is colorless and contains an organic substance, such as nucleic acid and protein, which does not have light absorption characteristics for a visible region light but for a region of a ultraviolet light 6 emitted from an ultraviolet lamp 5. The recorded part 4 on the recording material 2 is irradiated with the ultraviolet light 6 by the ultraviolet lamp 5. Then, the ultraviolet light 6 is absorbed by the organic substance. A fluorescent light amount emitted from the recorded part 4 is zero or less than that emitted from the other parts. This difference in fluorescent light causes the recorded part 4 to be seen as if it were floated from the other parts. Thus, the recorded part 4 can be visually identified and read. |
