Method for controlling the PH of an ascorbic acid type developer.

摘要

A method is disclosed for developing an exposed radiation-sensitive silver halide material by means of a developing solution containing an ascorbic acid type developing agent, characterized in that the alkalinity of the developing solution is maintained at a desired constant pH level by means of a redox potential measuring system, e.g. a carbon / calomel electrode pair or a platinum / calomel electrode pair. Preferred developing agents are l-ascorbic acid and iso-ascorbic acid. Equally disclosed is an apparatus for maintaining the pH of a ascorbic acid type developer at a constant value comprising a redox electrode system and a control arrangement capable of feeding an alkali solution to the developer.