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1950
SYNTHETIC COLOR-FORMING BINDERS
471
time, with no other compensating change, throws the contrast relations of the three layers into incorrect balance. Since different developing machines do not give identical results, some adjustments may be needed to obtain a balanced development.
In general, the composition of processing solutions, particularly the developer, must be maintained to closer tolerances than are allowable in black-and-white photography. It is imperative that replenishment be based on accurate analytical techniques. It is recommended that the developer be replenished continuously, though the other solutions, which have wider tolerances, may receive batch wise additions of re
TABLE II. Formulas for Processing Type 275 Color Film.
Developer p-Aminodiethylaniline
Monohydrochloride . . 2.5 g Sodium Sulfite, anhyd. . 10. Og Sodium Carbonate, mono
hyd 47. Og
Potassium Bromide ... 2 . 0 g Water to make 1.01
pH = 10.5 (approx.)
Bleach
Potassium Ferricyanide . . 100 g
Boric Acid 10 g
Borax 5 g
Water to make 11
pH = 7.0 to 7.5
First Fixer
Hypo, crystals 240 g
Sodium Sulfite, anhyd. . . 15 g
Borax 18 g
Acetic Acid, 28% 43 cc
Potassium Alum 20 g
Water to make 11
pH =4.5 (approx.)
For use: dilute 1 part solution
to 2 parts water
Second Fixer
Hypo, crystals 200 g
Water to make 11
pH = 8.0 (approx.)
plenisher. Analytical techniques are available, but their description is outside the scope of this paper.
Processing Machine Design
Figure 9 illustrates a form of continuous developing machine for Type 275 Color Film. The sketch is schematic and is intended to suggest only the proper tank arrangement. As far as details of design and construction are concerned, this particular process does not necessitate any features different from good black-and-white practice. In fact, a black-and-white machine may be converted provided it has enough tanks to allow proper arrangement of solutions.