FLUORESCENT LIQUID INK COMPOSITION FOR INKJET PRINTING

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Ink composition which is invisible to the naked eye, which is fluorescent, for inkjet printing, and which is liquid at ambient temperature, comprising : a) a binder, comprising at least 0.5% by weight, with respect to the total weight of the ink, of at least one thermoplastic polyamide resin, soluble in ethanol; b) a solvent comprising at least 10% by weight, with respect to the total weight of the ink, of one or more organic solvent compound (s); c) at least 0.05% by weight, with respect to the total weight of the ink, of one or more dye(s) and/or pigment (s) which is (are) invisible to the naked eye and which is (are) fluorescent in the visible region only when they are exposed to ultraviolet light and which are chosen from rare earth metal chelates and rare earth metal complexes; d) less than 10% by weight of water, with respect to the total weight of the ink. Marking process, substrate and method for identifying items.