LESSON 1
c. If you use a hypo eliminator, the washing procedure is modified as
follows:
(1) Remove the film from the fixer.
Rinse the film in running water
for 30 seconds to remove the excess hypo.
(2) Immerse your film in hypo eliminator for 2 minutes.
(3) Wash the film in running water for 5 minutes.
d. As you can see the use of hypo eliminator drastically reduces the
wash time for film, saving you both time and water.
e. Wetting agent. After the film has been washed, it should be placed
in a wetting agent. Photo-flo is the common term used when referring to a
wetting agent.
Wetting agents are high grade detergents that prevent the
formation of water marks by breaking down the water molecule, reducing the
surface tension of water, and allowing the film to dry evenly.
The film
should be immersed in the photo-flo for one minute.
f. Film drying.
When film is dried under normal temperature
conditions, the process is relatively simple.
The major concern at this
point is dust. Foreign particles suspended in the air are easily trapped in
the soft emulsion.
For this reason a clean, dust free environment is a
necessity when drying your film.
If speed is essential, the film can be
dried in a diluted methyl alcohol bath or a cabinet with warm circulating
air.
9. Tray Processing Sheet Film. To ensure good negative uniformity in the
processing of sheet film, the following procedure should be used.
a. Use four trays slightly larger than the film.
Arrange the solutions
in the following order:
(1) Preliminary water bath (presoak)
(2) Developer
(3) Stop bath
(4) Fixer
b. Pour at least 1/2 inch of solution into each tray.
c. Arrange the trays in a row as follows: the preliminary water bath,
the developer, the acid stop bath, and the fixer last (fig 1-10).
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