| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a new system antifalsifying card, the cost aspect and productivity of which are excellent, the judgment of authenticity of which is simply and easily confirmed by visual recognition or through optical mechanical reading and further which has excellent opacifying properties of authenticity judging marks and, in addition, which has highly difficult properties against the production of forged goods or against the alteration of genuine goods. SOLUTION: At the prescribed part of the base material surface of the card, authenticity judging marks formed with ink including a variable color coloring matter composition, the color tone of which reversibly changes with the absence and presence of oxygen, are applied under the state that the color tone is kept at a color tone under oxygenated state.</p> |
