The function
of the developer is to bring out the latent image held in the
emulsion. This is achieved by a chemical reaction, acting on the
silver, producing dark areas where it is light and bright areas where
there is shadow. The negative is reversed later with the print. The
two most important things to keep at the front of your mind are: the
development time and the temperature. It is these two factors that
ensure the ultimate image quality you later produce in the print. Too
short a development time will produce too thin a negative, like wise
too long a process time will make the negative too dence, leading to
very short and very long print times.
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