MULTILAYER ARTICLE HAVING SECURITY ELEMENT ON SURFACE OF PAPER OR POLYMER CARRIER, ARTICLE AUTHENTICATION METHOD Russian patent published in 2014 - IPC D21H19/00 B42D25/00 

FIELD: physics.

SUBSTANCE: article comprises a carrier and a multilayer security element having a latent image. The security element is invisible when the document is viewed at a right angle, but becomes visible when the viewing angle is changed. The latent image is in the form of two identical graphic elements of different colours, which are formed by mutual displacement of portions of three-dimensional raster and raster of a multi-colour coating by a distance which is a multiple of half the period of the raster, and which are located in the same plane. The elements are located at a distance which enables observation of a stereoscopic image thereof using anaglyph glasses and/or colour filters.

EFFECT: high security of a valuable document.

15 cl, 7 dwg