FIELD: physics; image processing.
SUBSTANCE: present invention pertains to a protective element for counterfeit protected paper, valuable documents etc. as well as the counterfeit protected paper and valuable documents, method of making such a protective element, printing ink containing pigment with variable optical properties and method of making such printing ink. The protective element contains a thin-layer element with a colour tilt effect, consisting of a reflecting layer, absorbing layer and an intermediate layer between the reflecting layer and the absorbing layer. The intermediate layer is formed by the printing layer, containing dispersed particles with monomodal or oligomodal size distribution.
EFFECT: obtaining a simple protective element which can be made cheaply and which has high level of security from counterfeit.
62 cl, 12 dwg
