| 摘要 |
PROBLEM TO BE SOLVED: To provide a concentrated three-part color developing composition usable in various processing units and to provide a method not accompanied by anxiety about precipitation and loss of sensitometric property. SOLUTION: The three-part color developing kit comprises (I) a first concentrated aqueous solution having a pH of 11-13.5 and containing at least 0.25 mol/l sulfite ions, at least 2.5×10-<5> mol/l iodide ions, at least 0.05 mol/l bromide ions and at least 0.5 mol/l buffer having a pKa of 11-13.5, (II) a second concentrated aqueous solution having a pH of 3-6 and containing at least 1 g/l vinylpyrrolidone polymer and at least 0.05 mol/l organic antioxidant and (III) a third concentrated aqueous solution having a pH of 1-3 and containing at least 0.05 mol/l color developing agent and at least 0.005 mol/l sulfite ions.
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