Kodak 8059370 Fiche technique télécharger pdf (Page 3)

KODAK PROFESSIONAL BW400CN Film • F-4036 3

PROCESSING

Process BW400CN Film in KODAK FLEXICOLOR

Chemicals for Process C-41. You can have this film

processed by any photofinisher who processes color negative

films like KODAK PROFESSIONAL PORTRA Film.

BW400CN Film is fully compatible with Process C-41, and

can be intermixed with color negative films during

processing in all equipment, from minilabs to high volume

continuous, roller transport, or rack-and-tank processors.

You can also use KODAK FLEXICOLOR Chemicals in

the 1-gallon size to process this film in a small tank or a

rotary-tube processor. For specifications on Process C-41,

see Kodak Publication No. Z-131, Using KODAK

FLEXICOLOR Chemicals.

Important

Do not process this film in conventional black-and-white

chemicals.

Negative Appearance

The appearance of processed negatives on BW400CN Film

is similar to color negative films, but with no color in the

negative images.

JUDGING NEGATIVE EXPOSURES

You can check the exposure level of the processed negatives

with a suitable electronic densitometer equipped with a filter

such as the red filter for Status M Densitometry, or a

KODAK WRATTEN Gelatin Filter No. 92. Depending on

the subject and the light source used for exposure, a normally

exposed color negative measured through the red filter

should have the approximate densities listed below. These

densities apply for the recommended light sources and

correct processing of the negative.

Densities of Properly Exposed and Processed

Negatives:

KODAK Publication No. R-27

†

Because of the extreme range in skin color, use these values only as a

guide. For best results, use a KODAK Gray Card (gray side).

Area on the Negative: Densities:

The KODAK Gray Card

(gray side) receiving

the same illumination as the subject

0.80 to 1.00

The lightest step (darkest in the negative) of

a KODAK Paper Gray Scale receiving the

same illumination as the subject

1.15 to 1.35

Normally lighted forehead of person with

light complexion

†

1.05 to 1.35

Normally lighted forehead of person with

dark complexion

†

0.90 to 1.20

RETOUCHING

Treat the negative as if it were a color negative.

You can retouch 120 / 220-size BW400CN Film on both

the emulsion and base sides. 35 mm film can be retouched on

the emulsion side only.

Both retouching dye and black graphite lead pencil can be

used to retouch this film. When retouching with pencil on the

emulsion side, use KODAK Retouching Fluid to improve

the tooth of the film.

If you plan to use retouched BW400CN Film for printing

on color negative paper, follow the Dye / Filter “Layering”

Technique.

For more information about retouching techniques,

supplies, and equipment, see KODAK Publication E-71,

Retouching Color Negatives.

Dye / Filter Layering Technique

To retouch small areas, use diluted KODAK Liquid

Retouching Colors. For most retouching, you will need only

two dyes: red-yellow and cyan. Prepare the diluted dyes

according to the following formulas:

1. Hold a WRATTEN Gelatin Filter No. 58 (green) near

your eye, and view the negative through the filter.

Evaluate the areas to be retouched; if they appear

lighter than the surrounding areas, apply red-yellow

dye by using the technique described in step 2.

2. Dip the brush into the dye, and stroke the tip on

water-dampened cotton, tissue, or paper towel until the

tip is almost dry. Smoothly apply a small amount of dye

to the base side of the negative.

Note: When you retouch along sharp edges in an image or

make very fine corrections, apply dye to the emulsion side.

This allows for more precise alignment of the retouching

with the image and avoids parallax problems from inaccurate

application.

3. Hold a WRATTEN Gelatin Filter No. 25 (red) near

your eye, and view the negative through the filter.

Evaluate the areas to be retouched; if they appear

lighter than the surrounding area, apply cyan dye by

using the technique described in step 2.

Water:

Diluted

Dyes

Formula Dilution 1 Dilution 2 Dilution 3

Red-yellow 5 drops

red dye

plus 1

drop

yellow dye

plus

distilled

water

18 drops

distilled

water

(1:3)

30 drops

distilled

water

(1:5)

60 drops

distilled

water (1:10)

Cyan 3 drops

cyan dye

plus

distilled

water

15 drops

distilled

water

(1:5)

30 drops

distilled

water

(1:10)

60 drops

distilled

water (1:20)

1 2 3 4 5 6

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