| 摘要 |
<p>The security paper incorporates, as fundamental characteristic, groups of security yarns which are braided within each group, using at least three yarns so that such braiding presents a very characteristic irregular surface, easily detectable by touch, for identification of the document either by the bank staff or by blind people. The use of yarns of different colours in each braiding allows to form colour combination which collaborate in the personalization of the yarn and, consequently of the document, for example the colours of the national flag corresponding to the country issuing the document.</p> |
