Kodak CIS-144 - Manual (Page 4)

Supplementary Information on KODAK EKTAMAX RA Professional Paper
Minor Revision 3-00
Printed in U.S.A.
Supplementary Information on
KODAK EKTAMAX RA Professional
Paper
KODAK Publication No. CIS-144
Leuco cyan dye/low bleach-fix pH
Leuco cyan dye is due to a low pH in the bleach-fix caused
by a high replenishment rate or incorrect start-up (fresh tank)
mixing procedure. It results in a warm reddish image tone
due to some of the cyan dye being converted into an invisible
state. Leuco cyan dye conditions that cause problems with
color paper are also reflected in control plots (the black patch
tends to have a lower red density than green and blue).
EKTAMAX RA Paper will generally alert you to this
condition before you see it on color paper production or in
your control plots.
You can correct this problem by increasing the pH of the
bleach-fix. Add KODAK EKTACOLOR RA Developer
Starter, CAT 102 6681, or KODAK EKTACOLOR RA
Bleach-Fix Desilvering Concentrate, CAT 844 4572,
according to the following table.
Caution
Before making changes to the bleach-fix, verify that the hue
is red (indicating low cyan dye) and not pink (indicating high
magenta dye). Overuse of this prescription will cause other
bleach-fix problems.
Note: When you add developer starter to the bleach-fix,
foaming will occur. Turn off the bleach-fix recirculation
system and add the starter very slowly. Wait several minutes
for any foaming to dissipate before turning the recirculation
pumps on. You may want to consider removing some
bleach-fix from your working tank and adding the starter to
that solution to avoid any chance of the bleach-fix foaming
over and contaminating your developer tank. Slowly stir the
starter into the bleach-fix solution, wait for any foaming to
dissipate, then slowly return the solution to your bleach-fix
tank.
Addition of KODAK EKTACOLOR RA Developer Starter
or KODAK EKTACOLOR RA Bleach-Fix
Desilvering Concentrate
If your processor
uses
Add this amount of EKTACOLOR RA
Developer Starter or EKTACOLOR RA
Bleach-Fix Desilvering Concentrate
EKTACOLOR RA
Bleach-Fix and
Replenisher
12.0 mL/L of tank volume
EKTACOLOR RA
Bleach-Fix and
Replenisher NR
22.0 mL/L of tank volume
After you apply this prescription, allow the solution to
circulate for 15 to 20 minutes, and then process some test
prints. If the red hue is reduced but not eliminated, repeat the
prescription once. If the red hue does not change, do not
repeat the prescription. If the red hue remains after you
apply the prescription a second time, your process probably
has a developer problem or your viewing conditions are
inadequate (be sure that you are using the appropriate light
source).
To prevent leuco cyan dye problems, follow the
recommended start-up procedure and replenish your
bleach-fix correctly to ensure that the pH of the bleach-fix
will remain in the recommended range.
Note: If you use EKTACOLOR RA Bleach-Fix and
Replenisher NR to prepare a fresh tank solution, add only
one-half the normal amount of Part C to the mix. If you use
EKTACOLOR RA Bleach-Fix and Replenisher to prepare a
fresh tank solution, add 22 mL/L of tank volume of KODAK
EKTACOLOR Developer Starter, CAT 102 6681, to the
mix.
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