| 摘要 |
<p>The invention relates to a value and security product with at least one security characteristic, in particular value products like bank notes, cheque forms, shares, personal documents, credit and cheque cards etc. Known value and security products contain for the most part optically visible security characteristics, which do not afford sufficient security against forgery. To enhance security against forgery, the invention envisages that the security characteristic consists of a substance which can be detected as a gas.</p> |
