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Formulated by Gordon Hutchings, Bergger PMK is a 2-part film developer which produces a yellowish-green negative stain which is proportional to the amount of silver - least in the shadows where there are areas of low silver density, and greatest in the highlights. The stain masks film grain by filling in between the silver grains, resulting in both increased acutance and finer tonality.
An alkaline fixer such as Bergger Berfix Neutral is recommended to maintain best tone and stability.
Standard dilution 1+2+100 gives 25 litres of working solution.
Concentrates have a long shelf life.