| 摘要 |
PURPOSE:To obtain a single dispersion type silver chlorobromide emulsion hardly causing fogging and having high sensitivity by using an ammoniacal silver nitrate soln. as a silver ion soln. CONSTITUTION:The ammoniacal silver nitrate soln. is used as the silver ion soln. The ammoniacal silver nitrate soln. is obtd. by adding an equiv. or more of ammonia to an aqueous silver nitrate soln. so as to prepare a silver-ammine complex soln. When a silver ion soln. is mixed with a halide ion soln. to form silver halide contg. silver chloride, the ammoniacal silver nitrate soln. is used as the silver ion soln. At the moment when the ammoniacal silver nitrate soln. is added to the halide ion soln., a silver-ammine complex is predominantly present and the concn. of free silver ions is much lower than the concn. of free silver ions produced by adding a silver nitrate soln. Accordingly, the formation of silver oxide is extremely reduced, the reduction of silver oxide to metallic silver hardly occurs and the fogging is suppressed. |
