FIELD: magnetically induced mark.
SUBSTANCE: present invention is related to a method for authenticating a magnetically induced mark deposited on a substrate and containing magnetically oriented partially reflective laminar magnetic or magnetizable pigment particles using a portable device equipped with a light source configured to supply visible light, an image forming device, a processor and memory, the method comprising calculating, by a processor, a corresponding average intensity I of light reflected by the partially reflective laminar magnetic or magnetizable pigment particles and collected by the image forming device at an appropriate viewing angle θ, storing the calculated average intensity of the reflected light and the corresponding viewing angles to obtain a reflected light intensity curve I(θ), comparing the stored reflected light intensity curve I(θ) with the stored reference reflected light intensity curve Iref (θ) for the specified magnetically induced mark, and determining whether the magnetically induced mark is genuine based on the result comparisons.
EFFECT: increase of security and authentication of the mark.
7 cl, 17 dwg
