To rapidly recover a base and silver from a heat developable material in high yields and to obtain an original starting material in a high yield by separating a coating on the PET base of a heat developable material and converting the PET to a supercritical fluid.
In the method for treating a used heat developable material containing photosensitive silver halide grains, an organic silver salt, a reducing agent and a binder on the base, the base is separated from the heat developable material by a method comprising 1 a step for cutting the heat developable material into chips of 0.1 mm2 to 100 cm2 width (expressed in terms of area), 2 a step for immersing the chips in acidic or alkaline water containing an oxidizing agent at 60-140°C to remove a coating from the base within 1 min to 8 hr, 3 a step for separating the base from the coating with a filter and 4 a step for drying the separated base with hot air at 40-100°C.
NISHIWAKI SHU
MITSUHASHI TAKESHI
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