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Abstract
The mechanism of the silver complex dependence of superadditivity in physical development was studied by physical development on an evaporated gold layer and current measurement using a comparable model cell to the development. The development rate of the thiocyanate developer including Phenidone/hydroquinone or Phenidone/ascorbic acid agreed with that calculated from the theoretical equation for the catalytic current, while the development rate of the thiosulphate developer was much smaller than the theoretical value. The current flowing through the external circuit of the cell is governed by the silver complex used in the anodic bath. It was concluded that thiocyanate has no influence upon the anodic process of Phenidone, while thiosulphate inhibits it.