Kodak E-142 manual Darkroom Recommendations, Printing Equipment, White-Light Exposure Method

DARKROOM RECOMMENDATIONS

Handle this paper in total darkness. Be sure that your darkroom is lighttight. Eliminate stray light from enlarger heads, timers, LEDs, etc.

Note: Using a safelight will affect your results. If absolutely necessary, you can use a safelight equipped with a KODAK 13 Safelight Filter (amber) with a 71⁄ 2 -watt bulb. Keep the safelight at least 4 feet (1.2 metres) from the paper. Run tests to determine that safelight use gives acceptable results for your application.

EXPOSURE

Printing Equipment

Expose this paper in automatic printers or enlargers equipped with tungsten or tungsten-halogen light sources or photo enlarger lamps (e.g., No. 212 or 302). Set up and balance the printer or enlarger according to the manufacturer’s instructions.

Do not use fluorescent lamps to expose this paper. Use a heat-absorbing glass to remove infrared radiation. Because voltage changes affect light output and color quality, use a voltage regulator.

Keep negatives and the equipment optical system clean. Mask negatives to eliminate stray light. You can use the white-light or the tricolor exposure method.

White-Light Exposure Method

Control color balance with dichroic filters built into the printer or enlarger, or with KODAK Color Printing (CP) Filters (Acetate) placed between the lamp and the negative. You can use any number of filters between the light source and the negative. If you use cyan filtration, use filters with the suffix “-2” (e.g., “CP10C-2”).

1.Start with a filter pack of 50M + 70Y to make a test print.

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

3.Judge 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
	Open the lens
TOO LIGHT	aperture to		Increase the
	increase the light		exposure time
	level
	Close the lens
TOO DARK	aperture to		Decrease the
	decrease the light		exposure time
	level

4.Then judge the color balance. You can use the KODAK Color Print Viewing Filter Kit, KODAK Publication No. R-25, to evaluate your test print. The kit contains 18 color-print viewing filters and instructions to help you determine filter adjustments for the white-light exposure method.

If your	Subtractthese	OR	Add these
print is	filters		filters
CYAN	Magenta + Yellow		Cyan
	(Red)
MAGENTA	Cyan + Yellow		Magenta
	(Green)
YELLOW	Magenta + Cyan		Yellow
	(Blue)
RED	Cyan		Magenta + Yellow
GREEN	Magenta		Cyan + Yellow
BLUE	Yellow		Cyan + Magenta

5.Remove neutral density from your filter pack. For example, if you determine that a filter pack of

40R + 10Y + 10C will give you a pleasing print:

a.Convert any primary filters (R, G, B) to their subtractive equivalents (C, M, Y):

40R = 40M + 40Y.

b.Add filters of the same color: 10Y + 40Y = 50Y.

c.If the new filter pack has all three subtractive colors, cancel the neutral density by subtracting the smallest density value from all three densities:

10C 40M 50Y

–10 –10 –10

filtration without

30M 40Y =

neutral density

2 KODAK PROFESSIONAL ULTRA III Paper • E-142