To provide a sensitized material for silver halide photograph and a sensitized material for heat development that have high sensitivity, high ultimate concentration, high image quality and excellent shelf stability, to provide a method for forming image, and to obtain a new hydrazine compound that has high covering power even at a decreased silver amount of coating. 感度、最高到達濃度が高く、画質が良好で、更に生保存性に優れたハロゲン化銀写真感光材料、熱現像感光材料、画像形成方法、及び塗布銀量を減らした際でも優れたカバーリングパワーを有する新規なヒドラジン化合物を提供する。 - 特許庁