Re:Relative age of pyro developer formulas?

While pyro is one of, if not the earliest developer, it was not until Gordon Hutchings formulated PMK that it became practical for modern films. In early pyro formulas the stain was unpredictable and difficlult to control. Other pyro developers (Kodak D-1, Weston's version of ABC pyro, etc.) cause a loss of film speed. When pyro is combined with metol, the result is full film speed and excellent stain characteristics. See the December '97 issue of Camera Arts Magazine for an excellent article by Gordon Hutchings.

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