| 摘要 |
PURPOSE:To raise a speed of etching a metallic thin film, by adding a metal- chelating agent to a processing soln. to be used for developing a metallic image forming material or reducing dots. CONSTITUTION:A metal-chelating agent, e.g., sodium anthraquinone-2,6-disulfonate is added to a developing soln. for developing a metal image forming material or a reducing soln. for reducing dots or the like to give >=0.01mol agent/liter of processing soln. Said metallic image forming material has a photosensitive layer or an imagewise corrosion resistant layer on a support provided with a metallic thin layer, thus permitting no bubble to be produced during etching the metallic thin film, the processing soln. has always good contact with the metal to be etched due to high wettability, and unevenness in etching to be prevented. |
