e. At the end of the development time, remove the lid and pour the
developer solution from the tank through the hole as fast as possible.
f. Fill the tank with stop bath. Agitate continuously for 3060
g. Drain the stop bath, pour the fixer into the tank and agitate the
film continuously for 15 seconds. Continue this agitation for 5 seconds
every 30 seconds or 10 seconds every 60 seconds. After 2 minutes in the
hypo you can remove the light tight cover and finish processing under room
h. Drain the hypo and wash the film by allowing a stream of water to
run through the tank or by removing the film reels to a washing tank. As
usual the wash time is 30 minutes unless a clearing agent is used. Washing
efficiency can be improved by dumping the water from the tank every three
minutes and then placing the tank back under the running water.
i. Drain the water and pour the photoflo into the tank. Tap the tank
to dislodge the air bubbles.
j. Drain the photoflo and hang the film to dry.
13. Summary. You should now be familiar with the processing of photographic
film to include: identification, developing methods, how to determine time
not sure of, go over it again. If you feel competent in your knowledge of
the material, go on to Learning Event 3.
Learning Event 3:
DESCRIBE PHOTOGRAPHIC PAPER
1. General. As with film, when light strikes the minute silver halides
embedded in the gelatin layer of a paper emulsion, a chemical change takes
place creating the latent image. Subsequent processing in chemical
developers makes the invisible latent image visible.
The anatomy of photographic paper.
a. Photographic print papers (fig 112) are composed of the following