| 摘要 |
<p>A photographic color forming agent composition comprising an aromatic primary amine color developing agent and the following materials (A), (B) and (C). (A) is at least one kind of the compounds each having an aromatic ring bearing two hydroxy groups in the ortho positions thereof, respectively. (B) is at least one kind of hydroxyalkylidene-diphosphonic acid metal ion chelating agents. And, (C) is at least one kind of the metal salts selected from the group consisting of the water-soluble metal salts of magnesium, bismuth, aluminum, zinc, barium, or zirconium, said metal salt is equivalent to or more than the metal ion chelating agents mentioned in the item (B) above. Such composition of a photographic color forming agent is so stable that a preserving agent contained in a color developing liquid is hard to be decomposed by the action of metal ions such as iron ions and copper ions in particular. In addition, it is capable of preventing the photographic characteristics from causing any abnormality even when processing in the presence of heavy metal ions such as copper ions in particular. It is also capable of preparing a color developing liquid which is so stable that any precipitation or sludge cannot be produced even in the presence of metal ions.</p> |
