PHOTOSENSITIVE MATERIAL

PURPOSE:To speed up heat development and to stabilize the photographic performance against a fluctuation in developing temp. by housing >=2 kinds of silver halides which have substantially the same color sensitivity and vary in sensitivity into the same microcapsules or different microcapsules. CONSTITUTION:Two or more kinds of the silver halides which have substantially the same color sensitivity and vary in the sensitivity are housed in the same microcapsules or the different microcapsules. The term 'substantially the same color sensitivity' means that the photosensitive wavelength regions are the same although the peak wavelengths of the sensitivity may vary. The sensitivity is defined as the exposure to apply the intermediate density of the max. image density and the min. image density when the same exposing and the same development processing is performed as the exposing and development processing at the time of using the photosensitive material formed by using just one kind of the silver halide. The photographic characteristics possessed by the respective silver halides are overlapped to correct the changes thereof with each other by the combination of the two or more silver halides in such a manner. The change in the photographic characteristics by the developing temp. is thereby lessened. The thermal development is speeded up in this way and the photographic performance with a change in the developing temp. is stabilized.