| 摘要 |
The present invention provides in a first aspect a method of manufacture of a security product suitable for use with security articles including security paper such as that used for banknotes, wherein a magnetic metal (10) is deposited on a film of polymeric substrate as the substrate passes through a solution containing the magnetic metal, and a preparatory operation is carried out on a surface of the substrate prior to immersion of the substrate in the solution, characterised in that the preparatory operation ensures that magnetic metal (10) is deposited on the substrate in a chosen pattern such that when the security product is produced from the film by cutting the film, the magnetic metal (10) on the security thread has a specific pattern and provides both a visual discernible security feature and a magnetically detectable security feature. The present invention provides in a second aspect a security product for security paper such as banknotes, the security thread comprising a polymeric substrate, catalytic material covering at least a portion of one surface of the polymeric substrate, and a layer of electrolessly deposited magnetic metal (10) covering at least a portion of the catalytic material with a depth in the range 0.01-3.0 mu m. |
