To obtain a fluorescent substance slurry for a color cathode-ray tube which is suitable when a non-Cr-based photosensitive material is used.

This fluorescent substance slurry for the color cathode-ray tube is characterized as suitable when a photosensitive resin composition having a constituent unit represented by the following formula I {wherein, Ar is selected from the group of the following (II) [X is lithium, sodium, potassium, ammonium, a monoalkylammonium, a dialkylammonium, a trialkylammonium or a tetraalkylammonium] ; (k) is 1-3; and (l:m:n) is (0.1-3.0):(85-94):(5-14)} is used as the photosensitive material and comprising a polycarboxylic acid-based compound in the fluorescent substance slurry.