With this type
of developer it is possible to double or treble the speed of a film.
These developers promote an extremely strong response in the
emulsion. They can increase the speed in a film that is too slow for
the job. It can reliably produce a speed increase of up to three
times with this pushed process. The big advantage with these
developers is being able to keeping the grain fine and a good degree
of sharpness. You need to be carefull when using them and follow the
instructions. There are a couple of makes that have these attributes:
Ilford Microphen and Promicrol.
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