Holographic foils as striking security features
Holographic foils are attractive and striking security features for protection against counterfeiting that enjoy high levels of public acceptance. Their production involves complex processes and they cannot be reproduced by digital copiers. Incorporating diffractive surface elements, foil colors and patterns can be variable and designed to suit particular customer requirements. These include creating holographic patterns with effects that simulate a movement, a change in shape, or three-dimensional elements.
Louisenthal’s extensive range of design options ensures that a foil is unique for a denomination and serves as a fortified barrier against counterfeiting. Demetallization of the foil offers transparent areas on the metalized foil surface. These transparent areas communicate different types of information to the observer viewing the banknote in direct light or through transmitted light.
Design options include variations of small and large text and graphical elements, patterns, or combinations of transparent demetallized areas and color areas. The process of de-metallization ensures optimum contrast and high resolution, and is inherently secure. Unlike commercially available foils, Louisenthal’s foils show metallization effects, e.g. aluminum plus gold, chrome, or copper, in bi-metallic foil elements.
To further enhance the security of the foil to protect against counterfeiting, holographic foils can be equipped with covert security features. These include elements visible under UV, polarized or laser light.