PRINTED MATTER EXHIBITING MIXED-COLOR FLUORESCENCE EMISSION

摘要

PROBLEM TO BE SOLVED: To provide printed matter that exhibits fluorescence emission comprising two mixed fluorescent colors according to an observation condition by using an ink composition comprising at least one inorganic or organic fluorescent material and a resin composition emitting fluorescence under a predetermined condition.

SOLUTION: The printed matter has a printed region formed on a base material printed with an ink comprising a resin composition that emits a first luminescent color by a two-photon excitation where the resin composition forms an excited substance by irradiation with an ultraviolet ray having a first wavelength regionλ1 and the excited substance is excited by irradiation with an ultraviolet ray having a second wavelength regionλ2 after the irradiation with the ultraviolet ray having the first wavelength regionλ1 and a fluorescent pigment emitting a light having a second luminescent color different from the first luminescent color, and the printed matter emits fluorescence to be observed in a second luminescent color by irradiation with the ultraviolet ray having the second wavelength regionλ2 and emits a light having a third luminescent color comprising fluorescent colors composed of a mixture of the first luminescent color and the second luminescent color by irradiation with the ultraviolet ray having the first wavelength regionλ1 and subsequent irradiation with the ultraviolet ray having the second wavelength regionλ2.

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