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Invention

发布时间:2019-03-03 05:06:06来源:未知点击:

By Barry Fox MAKING CASH SPARKLE As colour ink-jet printers get better, it is becoming ever more expensive to foil banknote forgers. The latest wheeze, from paper manufacturer Landqart in Switzerland (world patent filing WO 2004/104277), is to embed fine, photoluminescent polymer fibres in banknote paper. These 3-millimetre lengths of cellulose are coated with a UV-sensitive dye such as stilbene. Landqart found that if the cross section of the fibres is a squashed oval or a flattened rectangle,