(c) Store the developer replenisher solution in a tank with both a
dust cover and a floating lid.
The floating lid reduces oxidation.
The
dust cover keeps out dirt and helps control evaporation.
d. Contamination.
Low-level contamination of the developer solution
with bleach/fix is mostly seen in the red and green plots of the LD and HD-
LD parameters. As the level of contamination increases, the "stain" plots
will go upward, especially the red.
12.
Bleach/Fix Variables.
There are two types of bleach/fix variations: mechanical and chemical.
a. Mechanical.
Follow time, temperature, and agitation closely to
assure that certain bleaching and fixing reactions continue until completed.
Otherwise, retained silver and/or leuco cyan dye can be expected.
Retained silver appears as black metallic silver in the paper. Leuco cyan
dye is a clear cyan dye caused by incomplete formation of the cyan dye.
Because formation of the cyan dye actually continues into the bleach/fix
solution, leuco cyan dye indicates a problem with the bleach fix solution.
b. Chemical.
Abnormal oxidation of the bleach/fix solution causes
sulfurization.
The corrective action for sulfurization is dumping.
The
corrective action for oxidation, before it leads to sulfurization, is to add
a preservative.
NOTE:
Sulfurization can be physically seen in a processor tank as a dark
precipitate before it appears in the Y-55 plots. In a replenisher
storage tank, it appears as a light-colored precipitate.
16.
Summary.
This concludes lesson 3.
Before proceeding to lesson 4, complete the
following practice exercise.
If you have difficulty with any of the
questions, refer to the pages referenced in the practice exercise answer key
and feedback sheet.
3-16
SS0514
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