| 摘要 |
A method for producing a banknote in which the banknote is produced from paper pulp and provided with a fibre-thinned region, i.e. in the manner of a so-called watermark. The method is characterized by introducing into at least one region of the banknote (10) during its manufacture a reinforcement (5; 14) in the form of a material which has a greater mechanical strength than the paper fibres; thinning the fibres in at least a part of this region of the paper to an extent such that together with the reinforcement (5; 10) the region will form an optical window (15-21) through which the irradiating beams emitted by a colour copier are transmitted forwards and backwards; and by printing one or more signs or figures in the region of the optical window (15-21) within the optical window (15-21) and preferably only on one side of the banknote (10), the signs or figures being asymmetrical so that when the banknote is copied from one side thereof, the sign or the figure printed on the opposite side of the banknote will appear on the copy in a mirror-image form. The invention also relates to a banknote. |
