FLUORESCENT LIQUID INK COMPOSITION FOR INK JET PRINTING.

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Ink composition, invisible to the naked eye, fluorescent, ink jet, liquid at room temperature, comprising : a) a binder, comprising at least 0.5% by weight, relative to the total weight of the ink, at least one polyamide resin; b) a solvent comprising at least 10% by weight relative to the total weight of the ink of one or more compounds organic solvent (s); c) at least 0.05% by weight relative to the total weight of the ink of one or more dye (s) and/or pigment (s), (s) invisible to the naked eye, and fluorescent (s) only in the visible range when exposed to ultraviolet light, selected from the rare earth metal chelate complexes of rare earths; D) less than 10% by weight of water relative to the total weight of the ink. Marking method, substrate, and method for identifying objects.