| 摘要 |
PROBLEM TO BE SOLVED: To provide a printing plate formed of aluminum which allows easy washing-off and provides good image quality as its base. SOLUTION: The salts (i species) of the ratio (C1 ) at which I expressed by the following equation attains >=8.0×10<-4> mol/g with respect to the gelatin of silver halide emulsion layers are incorporated into the silver halide emulsion layers of the planographic printing plate formed by using the aluminum subjected to surface roughening and anodic oxidation as the base and including at least one layer of physical development nucleus layers and photosensitive silver halide emulsion layers on the base: I=1/2ΣC1 Zi <2> , where C1 =the molar number (mol) of i species of ions/weight (g) of gelatin, Zi =inonic value of i species of ions. |
