Basic Photography Course

Figure 10-13.Sheet film tank processing agitation.

The air bubbles that usually occur when dry film

is immersed in a solution can be removed without
harmful effects in the predevelopment water rinse.

When the water-softened emulsion is placed in

the developer, the action of the solution begins
uniformly over the entire emulsion. Thus uneven or
streaky development is avoided.

The predevelopment water rinse removes the

antihalation backing dye that interferes with the action
of some developers.

The predevelopment water rinse brings the

temperature of the film and the hangers to the processing

temperature. Maintaining constant temperatures in all of
the processing solutions is very important.

The predevelopment water rinse is given by

immersing the loaded hangers in a tank of water and
agitating them for about 2 minutes. The temperature of
the water should be the same as that of the other
processing solutions. The loaded hangers are then lifted
out of the water, drained by one comer, and processed
in the usual manner.

Immerse the hangers in the developer slowly and

smoothly to avoid splashing or the formation of air bells.
Air bubbles usually result when films are immersed
rapidly, especially when a predevelopment water rinse
was not used. All the hangers should be immersed
simultaneously to assure uniform agitation and
development.

Strike the hangers sharply against the sides of the

tank several times to dislodge any air bubbles that may

10-20

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Basic Photography Course

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DOFMaster for Windows On-line Depth of Field Calculator DOFMaster for Mobile Devices On-line Depth of Field Table Hyperfocal Distance Chart Articles FAQ Recommended Books Support Contact Links Home As an Amazon Associate I earn from qualifying purchases.	contents <- previous page next page -> Figure 10-13.Sheet film tank processing agitation. The air bubbles that usually occur when dry film is immersed in a solution can be removed without harmful effects in the predevelopment water rinse. When the water-softened emulsion is placed in the developer, the action of the solution begins uniformly over the entire emulsion. Thus uneven or streaky development is avoided. The predevelopment water rinse removes the antihalation backing dye that interferes with the action of some developers. The predevelopment water rinse brings the temperature of the film and the hangers to the processing temperature. Maintaining constant temperatures in all of the processing solutions is very important. The predevelopment water rinse is given by immersing the loaded hangers in a tank of water and agitating them for about 2 minutes. The temperature of the water should be the same as that of the other processing solutions. The loaded hangers are then lifted out of the water, drained by one comer, and processed in the usual manner. Immerse the hangers in the developer slowly and smoothly to avoid splashing or the formation of air bells. Air bubbles usually result when films are immersed rapidly, especially when a predevelopment water rinse was not used. All the hangers should be immersed simultaneously to assure uniform agitation and development. Strike the hangers sharply against the sides of the tank several times to dislodge any air bubbles that may 10-20 contents Basic Photography Course <- previous page next page ->	As an Amazon Associate I earn from qualifying purchases.
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