| 摘要 |
<p>There are provided a method of forming a forgery-preventive image and an apparatus therefor which are capable of easily making a forgery-preventive medium without spoiling ease of determination as to whether forgery has been committed. An image is printed on an ink image-receiving sheet by using a sublimable dye ink, thereby causing the sublimable dye ink to be held by the ink image-receiving sheet. The image-receiving sheet and a medium body overlaid upon each other are heated, thereby causing diffusion of the sublimable dye ink held in the ink image-receiving sheet in a surface of the medium body and color development. The amount of heat applied to the ink image-receiving sheet and the medium body is controlled so as to adjust depth of diffusion of the sublimable dye ink. <IMAGE></p> |
