物理現像の研究 (VII)
銀錯塩種の相違と現像速度
1989 年 52 巻 1 号 p. 28-32
詳細
1989 年 52 巻 1 号 p. 28-32
It has been investigated why thiocyanate as a complexing agent gives larger rate for postfixation physical development than thiosulfate when developers are adjusted to equal activity of silver ion and ionic strength as shown in our previous papers.
From the adaptation to Matejec's formulation for diffusion-controlled physical development and the apparent activation energy of 34-36 kJ mol-1 which is within the range of heats for diffusion-controlled processes, it is concluded that in the postfixation physical development, the determining step is the diffusion of developing agent or agents to the nuclei suface.
Thiosulfate retards significantly the diffusion of developing agent in the gelatin layer, and then slows down the rate of development.
