Pre-soak - preparatory water bath for film or paper prior to processing that prevents uneven development. It is essential in some color processes.
The center tank can also serve as a water pre-soak bath, if desired. A pre-soak is not an absolute necessity, since there is no danger of the films adhering to one another with this method. Also, Ilford does not recommend the use of a pre-soak.
Instead, I used a 2-minute pre-soak at 77F (if memory serves, that is one of the recommended temps and I used the corresponding recommended time).
 See also: Finder, Silver halide, Push, Space, Development
  
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