Kodak FC1, FC2 manual Plotting Control-Strip Densities

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

C-41Yellow

9141

D-max

HD

LD

D-min

Cutoff

Notch

KODAK Control Strip,

Process C-41

CAT No. 180 3709

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

	Aim-Value			Color-
Measure-	Adjust-	Action	Control	Balance
ment	ment	Limits	Limits	Spread
	Tolerance			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-maxb-Yb	±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-maxb-Ybaim 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.

4 Using the KODAK Negative Film Processing Cartridges FC1 and FC2 • CIS-254