Optical interference coatings for the inhibiting of counterfeiting

The counterfeiting of valuable papers and the forging of documents has always been a serious concern to all who issue such articles. In addition, labels of many highly prized brand-name consumer products are targets for counterfeiters. This threat has been increased by very significant improvements in color printing technology and by the development of color duplicating machines, both of which are capable of generating close reproductions of the original. Such new technology has made much of the traditional art of the counterfeiter obsolete.

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