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4 Using the KODAK Negative Film Processing Cartridges FC1 and FC2 • CIS-254
USING KODAK CONTROL STRIPS,
PROCESS C-41, TO MONITOR THE
PROCESS
Use KODAK Control Strips, Process C-41, to monitor
process performance
Each time you process a control strip, position it in
the same location in the processor. Process a control strip
at these times:
• At the beginning of the day or shift, before processing
customer work
• At the end of the day or shift
Plotting Control-Strip Densities
Create a control chart by using the KODAK Process
Record Form Y-55 or similar graph paper. Your chart
should have the same format as the Process CN-16S
“Visual Process Control Guide” shown on page 8.
Tolerances and Limits for KODAK Control Strips,
Process C-41
Measure-
ment
Aim-Value
Adjust-
ment
Tolerance
Action
Limits
Control
Limits
Color-
Balance
Spread
Limit
D-min ±0.03 +0.03 +0.05 —
LD ±0.04 ±0.06 ±0.08 —
HD-LD ±0.03 ±0.07 ±0.09 0.09
D-max
b
-Y
b
±0.07 +0.10 +0.12 —
1. Before you begin to use a box of control strips,
remove the reference strip from the box, and store it at
room temperature.
2. Use a precision densitometer to measure the densities
in the center of the Yellow, HD, LD, and D-min
patches on the reference strip. Do not move the strip as
you make the density readings or you may affect the
precision and repeatability of the measurement. Use
transmission mode Status M.
3. To obtain the aim densities, apply the correction
factors to the densities read in Step 2. The correction
factors are found on a sheet packaged with the
control strips. Make sure you use the correction
factors for Process CN-16S. To obtain the HD-LD
aim value, subtract the adjusted LD value form the
adjusted HD value. To obtain the D-max
b
-Y
b
aim
value, subtract the adjusted blue density of the yellow
step from the adjusted blue density of the D-max
step. Use the Process CN-16S Reference Aims
Worksheet on page 9 to help calculate the aim
densities.
Note: If you are using an older code of control strip
that does not list correction factors for Process
CN-16S, apply the Process Factors listed in the
following table to the density readings after applying
the regular correction factors for Process C-41.
C-41
9141
Yellow
D-max
HD
LD
D-min
Cutoff
Notch
KODAK Control Strip,
Process C-41
CAT No. 180 3709