摘要:
A photosensitive film, which has a transparent support (12) and a silver salt emulsion layer containing a silver salt formed thereon, is exposed and developed to form a metallic silver portion (16). The base material to be plated (32) is electrified in an electrolytic solution free of plating substances, using the metallic silver portion (16) as a cathode. Then, the electrified base material (32) is subjected to an electroless plating treatment to form a first plated layer (20) only on the metallic silver portion (16). The base material (32) is subjected to an electroplating treatment to form a second plated layer (22) on the first plated layer (20), further form a third plated layer (23) on the second plated layer (22).