SICHERHEITSVORRICHTUNG UND VERFAHREN ZU IHRER HERSTELLUNG

摘要

A security device comprises two or more regions ( 1, 2 ). Each region ( 1, 2 ) contains a material or combination of materials wherein the two or more regions exhibit substantially the same visible appearance under first viewing conditions and different visible appearances under second viewing conditions, the second viewing conditions. The second viewing conditions comprise a combination of a) visible light and b) substantially any UV wavelength.