Kodak E-4028 manual Latent-Imagekeeping, Processing, Tricolor Exposure Method

are due to differences in the color density of the print. For example, you have a print with acceptable density, but a magenta balance. When you add magenta filtration to correct the color balance, the print will become too light, so you must use a longer exposure time.

A rule of thumb for magenta dichroic filtration is to change the exposure time by one percent for every unit of change in filtration. For example, if you increase the magenta filtration by 20M, increase the exposure time by 20 percent. Changes in yellow dichroic filtration do not usually affect the apparent print density. If you use cyan dichroic filtration, use the filter factors in the table above as starting points for adjusting exposure.

Tricolor Exposure Method

Use KODAK WRATTEN Gelatin Filters No. 25 (red), No. 99 (green), and No. 47B (blue) to give the paper three separate exposures. Do not move the paper or the enlarger until you have made all three exposures. Typical exposure times for making an enlargement from a normally exposed negative are given in the table below.

Filter	Times for an Aperture Setting of f/8* for
	8 X 10 Enlargement of a 120 size KODAK
	PROFESSIONAL PORTRA Film Negative)
Red	0.7 seconds
Green	0.9 seconds
Blue	1.2 seconds

*For an enlarger equipped with a Photo Enlarger Lamp No. 212 or No. 302; the setting may vary with other types of lamps.

Evaluate the test print under light of the same color and brightness that you will use to display the final print. (See “Viewing.”)

Judge the print density first. If necessary, make another print by adjusting the exposure as recommended in the table below:

If your	Do this	OR	Do this
print is
TOO LIGHT	Open the lens		Increase all
	aperture to increase	OR	exposure
	the light level		times
			proportionally
TOO DARK	Close the lens		Decrease all
	aperture to	OR	exposure
	decrease the light		times
	level		proportionally
Then judge color balance:

If your	Subtract these	OR	Add these
print is	filters		filters
CYAN	Red		Blue + Green
MAGENTA	Green		Red + Blue
YELLOW	Blue		Red + Green
RED	Blue + Green		Red
GREEN	Red + Blue		Green
BLUE	Red + Green		Blue

LATENT-IMAGE KEEPING

Under normal conditions, you should not notice shifts in the latent image with keeping times from 5 seconds to 24 hours. Therefore, you do not need to change your printing procedures to compensate for latent-image shifts under normal temperature and handling conditions. (If shifts do occur, minimize them by keeping the interval between exposure and processing as consistent as possible.)

PROCESSING

Use KODAK EKTACOLOR RA Chemicals for Process RA-4, and use KODAK PROFESSIONAL Pro Srips Color Negative Paper Control Strips for Process RA-4 (see "Process Control").

When fully converted to this paper, your developer replenishment rate should be approximately 10% lower than with KODAK PROFESSIONAL PORTRA III and SUPRA

IIIPapers or KODAK PROFESSIONAL Color Metallic Paper. Review your process control charts and make adjustments as needed to stay in control.

Bleach-fix replenishment rates will stay the same for Process RA-4. When using KODAK EKTACOLOR PRIME Bleach-Fix Replenisher, replenishment rates will need to increase.

For detailed information on replenishment rates and processing this paper in continuous or roller-transport processors, see KODAK Publication No. Z-130, Using KODAK EKTACOLOR RA Chemicals. For information on processing this paper in trays or rotary-tube and drum processors, see KODAK Publication No. J-39, Tray, Drum, and Rotary-Tube Processing with KODAK EKTACOLOR RA Chemicals. Both publications are available through our

website at www.kodak.com/go/photochemicals.

Do not use drying temperatures above 93° C (200° F) to avoid damaging prints. Underdrying can produce tackiness that tends to make paper stick when it is wound into rolls before cutting. Overdrying can cause curl and complicate transport in print finishing.

Do not ferrotype this paper-its surface dries to a natural gloss without ferrotyping.

4 KODAK PROFESSIONAL ENDURA Metallic Paper • E-4028