PURPOSE: To enhance a live preservation of the titled material by compounding a binding agent in ratio of the binding agent to a high b.p. org. solvent of ≤1.0vol/wt and also the total amount of the binding agent composed of a photosensitive layer in a sensitive material of ≤10g/(m2).

CONSTITUTION: The titled material is prepared by providing more than two kinds of silver halide emulsion layers having a different sensitivity capable of forming a mobile dye corresponding or adversely corresponding to a latent image which is produced by heat-developing, after pictorially exposuring so as to obtain the image on a substrate. The above described material contains the high b.p. org. solvent having ≥175°C b.p. and also contains the binding agent in the prescribed ratio and the total compounding amount of the binding agent in the high b.p. org. solvent layer of the titled material.