| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a compsn. having no color by compounding a near-infrared ray absorbing dye having an absorption also in a visible region and a fluorescent dye having a luminescence compensating the absorption in the visible region. SOLUTION: This near-infrared ray absorbing dye is selected as appropriate from the known products complying with the use. For this fluorescent dye, a dye which discolors the color of the near-infrared absorbing dye, i.e., a dye which has luminescence in the region of the absorption in visible region of the near-infrared ray absorbing dye and compensates its absorption in a visible region is used. Since most of near-infrared ray absorbing dyes have absorption in the region of 400-500 nm and/or 600-700 nm, a fluorescent dye having luminescence in this region is used. The fluorescent dye includes inorg. dyes (e.g. Y2 O2 S: Eu). When a near-infrared ray absorbing dye is colored yellow, a fluorescent dye having luminescence in the region of 400-500 nm, when colored blue, a fluorescent dye having luminescence in 600-700 nm, and when colored green, both fluorescent dyes are compounded.</p> |
