| 摘要 |
PURPOSE:To prevent the forgery of a seal by a method wherein the sealed surface is coated with an ink containing one of two components and covered with a transparent film containing an ultraviolet absorbing agent so that the seal impression cannot be readily read. CONSTITUTION:On a print 2, a seal is stamped to form a seal impression 3 by using, instead of the vermilion ink, an ink containing the A material in a two-part liquid reaction type heat-sensitive color former. Subsequently, a cover 5, which is made of transparent film containing an ultraviolet absorbing agent and whose one surface is coated with an ink 4 containing the B material in the heat-sensitive color former, is attached to the sealed surface by using an adhesive gluing agent 6 so that the coating layer 4 surface is on the sealed surface side. The adhesive gluing agent 6 is applied to the periphery of the cover 5 so that the coating layer 4 is brought into contact with the sealed surface directly. After the cover 5 has been provided, if black light is applied, ultraviolet rays are absorbed, so that the portion of the ink 2 will not fluoresce. Therefore, there is no difference between the luminances of the reflected rays from the portions of the ink 2 and the ink 3, so that it is completely impossible to read the seal impression. |
