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A Photographers' Formulary P-Aminophenol Hydrochloride is a good economical film developer excellent for slower speed films (ISO 32-200). Unless graininess is desired, this developer is not recommended for faster films. This developer produces medium-grain negatives with good sharpness and is a good all-around developer for various films, even T-grain films. The contrast is variable and depends upon dilution and development times.
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Similar to Agfa Rodinal which uses potassium hydroxide as the accelerator and p-aminophenol as the sole developing agent.
This versatile developer can be used in variety of ways and adapted to very slow, fine grain films or with the fast ISO 400 or 500 films.
Paraminophenol is a developing agent with unique properties: it produces little fog and no stain even at high temperatures, is relatively fast-working, is less temperature-dependent than other agents, can be mixed and stored in very high concentrations, and retains developing potential even at very high dilutions.