FIELD: chemistry.
SUBSTANCE: pigment for the protective element contains a powder of flat particles with a thickness of 10-20 mcm and plane dimensions of 20-40 mcm. These particles comprise a core layer of magnetic material and external ink and/or interference layers that provide colour alternation when viewed from different angles. At least some of the pigment particles have the same dimensions and identifiable boundaries form specified in their manufacture and different by less than 3% for each of the particles. The outer layers are made of photosensitive transparent materials in which three-dimensional phase-contrast Bragg diffraction gratings are formed.
EFFECT: invention allows to obtain a pigment, the authenticity of which is reliably and simply controlled visually or by simple optical means.
3 cl, 2 dwg, 2 ex
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