Maximum-energy developer

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.