FIELD: printing.
SUBSTANCE: security document comprises a protective device attached to the first part of the document, at that the protective device comprises an area of piezochromic material and a contact structure attached to the second part of the document, which is different than the first part, at that on the contact structure a relief is formed. The security document is made with the ability to provide pressing of the protective device against the contact structure. The piezochromic material is arranged so that when pressing of the protective device and the contact structure to each other in the piezochromic material an optical effect is created, at that the said optical effect displays the said contact structure relief. The said optical effect is caused by deformation of areas of the piezochromic material so that to correspond to the relief of the contact structure.
EFFECT: proposed security document provides enhancement of its protection against forgery, as well as ease of establishing of its authenticity.
22 cl, 6 dwg
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