PMK FORMULA FILM DEVELOPER was developed by Gordon Hutchings, and is designed as a universal developer for a wide variety of modern emulsions used under diverse conditions. PMK stands for Pyro-Metol-Kodalk. Kodak has changed the name Kodalk to Balanced Alkali - this is their proprietary name for sodium metaborate. The formula is constituted to achieve the best overall results in consideration of the following technical criteria: sharpness, maximum image stain, minimum general stain, edge effects, film speed, flexibility for Zone System Plus and Minus development, stability, repeatability, convenience of use and long shelf-life.
An alkaline or pH neutral fixer is recommended for achieving maximum pyro stain on the negative. A conventional rapid fix may diminish staining effects of pyro and PMK formula. The PMK formula consists of two stock solutions. The A stock is the developer agents and the B stock is the alkali, or accelerator.
PMK Pyro is a staining-type developer which yields fine grained negative1 liter of working solution, which has a shelf life of only 1 hour.