A method for providing an object with a unique marking characterised in that it comprises marking such object with a physical chaotic marking process on the surface of a portion of said object, such physical chaotic marking process consisting of i) random deposition of particles over the surface and further incrustation, wherein said portion of the object consists of a incrustation portion made of a material with hardness and ductility which provide accommodation of incrusted particles, the material consisting of a metal, a polymer or a resin, said physical chaotic marking process consisting of incrustation of particles in the incrustation portion, such incrustation being performed by a) puncturing or b) application of a laser beam, on the surface of the incrustation portion, said particles being deposited on the surface prior to incrustation and therein incrusted after incrustation, and wherein such particles consist of diamond particles, approximately spherical, and wherein said particles covers an average area of 0.7-3.2 % of the area of the incrustation portion, the particles having a diameter between 50-100 μm and the surface of the incrustation portion having an area of 1-4 mm 2 , such surface of the incrustation portion consisting of a square with 1-2 mm sides; or ii) printing with a bondable fluid enriched with glitter particles, thereby providing a marking on such surface, wherein said bondable fluid consists of ink, glue, a resin or varnish, wherein the glitter particles have a diameter between 50-100 μm, wherein the glitter particles consist of metal particles non solvent in the bondable fluid, such particles being spherical or discoidal; wherein the glitter particles are randomly organised within the bondable fluid, and the glitter particles are dispersed in a low density along the marking and the amount of glitter particles range from 10 to 1000 glitter particles along the marking for a common label. i) random deposition of particles over the surface and further incrustation, wherein said portion of the object consists of a incrustation portion made of a material with hardness and ductility which provide accommodation of incrusted particles, the material consisting of a metal, a polymer or a resin, said physical chaotic marking process consisting of incrustation of particles in the incrustation portion, such incrustation being performed by a) puncturing or b) application of a laser beam, on the surface of the incrustation portion, said particles being deposited on the surface prior to incrustation and therein incrusted after incrustation, and wherein such particles consist of diamond particles, approximately spherical, and wherein said particles covers an average area of 0.7-3.2 % of the area of the incrustation portion, the particles having a diameter between 50-100 μm and the surface of the incrustation portion having an area of 1-4 mm 2 , such surface of the incrustation portion consisting of a square with 1-2 mm sides; or ii) printing with a bondable fluid enriched with glitter particles, thereby providing a marking on such surface, wherein said bondable fluid consists of ink, glue, a resin or varnish, wherein the glitter particles have a diameter between 50-100 μm, wherein the glitter particles consist of metal particles non solvent in the bondable fluid, such particles being spherical or discoidal; wherein the glitter particles are randomly organised within the bondable fluid, and the glitter particles are dispersed in a low density along the marking and the amount of glitter particles range from 10 to 1000 glitter particles along the marking for a common label. <EOS>