Abstract: Methods are disclosed that include directing electromagnetic radiation and/or heat to a structure, the structure including a substrate, a first layer, and a marking composition between the substrate and the first layer. At least a portion of the electromagnetic radiation and/or heat is transmitted through the first layer and the structure is marked.

Abstract: Ink composition for continuous deviated jet printing, which is liquid at ambient temperature, comprising: a)—a solvent, representing at least 10% of the total weight of the ink composition; b)—at least one compound that can be dissociated into at least one anion and at least one cation, said compound representing at least 0.1%, preferably from 0.1% to 20%, more preferably from 0.1% to 10%, better still from 0.1% to 5% by weight of the total weight of the ink composition; c)—at least one compound that complexes said cation or said anion, representing at least 0.1% by weight of the total weight of the ink composition. Process for marking objects using this ink and substrate provided with marking obtained by drying the ink composition.