| 摘要 |
PURPOSE: To premit the prevention of leakage of secret informations surely by a method wherein a transferring layer, containing an ultraviolet ray absorbing material, is provided in an area on the surface of a color developing agent layer while a sensitivity reducing ink layer is provided in an area opposed to the transferring layer of developer, in a pressure sensitive recording sheet constituted of superposed color developing layer and deloper layer. CONSTITUTION: A pressure sensitive recording sheet is constituted of a lower paper, in which a developer layer 12 and a sensitivity reducing ink layer 13 containing a fluorescent material are formed on a supporting body 11, and an upper paper, on which a transferring layer containing ultraviolet ray absorbing material and a color developing agent layer containing microcapsules 15a including a color developing agent are formed on the supporting body 16. The transfer layer 14 in a pressurized area is moved to the sensitivity reduced ink layer 13 together with color developing agent by the collapse of the microcapsules 15a whereby the color developing agent, the transfer layer 14 and the sensitivity reducing ink layer 13 are mixed in the area thereby forming the mixing layer on the developer layer 12. In the mixed layer, reading of images (letters) through ultraviolet ray projection is facilitated while the reading can be effected without misreading substantially. |
