A thermal negative type presensitized plate provided with an image recording layer hardened by infrared rays on an aluminum support, wherein the aluminum support has on the surface thereof, a grain shape with a structure in which a grained structure with medium undulation with a specified aperture diameter and a grained structure with small undulation with a specified aperture diameter are superimposed. For the presensitized plate, contact characteristics between the image recording layer and the support and scum resistance on a non-image area are kept compatible with each other at a high level, a thermal diffusion depression effect by which an energy generated by exposure can be efficiently used to form an image is excellent, and sensitivity is high.

 
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