Patent ID: 7473437

Claim:
A method of forming a fluorescent image, comprising forming a fluorescent image by using a fluorescent ink which contains a fluorescent coloring material in a content at which concentration quenching does not occur, and superimposing the fluorescent ink on the fluorescent image by an ink-jet recording method, wherein: in the image, an area in which dots of the image overlap accounts for 50% or more of the dots; the fluorescent ink comprises print ink containing: a first fluorescent coloring material that generates emission at a standard fluorescence wavelength to be used for measurement or determination among wavelengths resulting from fluorescent emission due to application of a standard excitation wavelength; and a second fluorescent coloring material that emits fluorescence by the standard excitation wavelength; and an emission wavelength region of the second fluorescent coloring material includes at least a main absorption wavelength region in a light absorption spectrum of the first fluorescent coloring material in an excitation wavelength region for obtaining the emission at the standard fluorescence wavelength of the first fluorescent coloring material in the ink.