Security printing has been published in the 90th Anniversary Special Issue of journal of printing science and technology for the first time. Security technologies must continually advance to confront improved methods of counterfeiting. For example, once everyone could make copies using copy machines, new security printing technologies, such as holograms, were developed to discourage illegal duplication. There is a rising need for security technologies to prevent the imitation of products exported overseas. This chapter introduces various security technologies involving paper, ink, printing, plating, and holograms. Security paper is particularly effective at deterring forgery, as it can only be produced in large-scale factories with specialized paper-making machinery. Invisible inks are also valued for security printing. Security through printing methods depends on the unique advantages of each printing method. Holograms have been adopted as high security elements in banknotes and credit cards. Both the volume and shallow types of hologram are explained in detail. New security printing technologies will continue to evolve in future years, due to the development of nanotechnology.
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