FIELD: physics.
SUBSTANCE: protective element contains a plurality of particles consisting of a core and a cladding. The core of the particles contains a magnetic fluid medium and is visually distinct from the magnetic fluid medium of a nonmagnetic phase, configured to move inside the magnetic fluid medium.
EFFECT: protective element with high degree of protection from forgery, whose outward appearance can be interactively affected during authentication to obtain a dynamic image.
29 cl, 9 dwg
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