1-[2-[4-[[[3-[[[[2-(Heptylthio)ethyl]amino]carbonyl]amino]phenyl]sulfonyl]amino]phenyl]hydrazide] 2,2,3,3-Tetrafluoro-butanedioic Acid can be used in technical or engineered material use of image-forming method by developing silver halide photographic material containing thioxoimidazolone using ascorbic acid.