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1949
COLOR LABORATORY
55
processing in eliminating bromide drag. Fig. 6 shows sensitometric curves for the cyan layer of Ansco Color Type 735. The set of curves marked A were those obtained without using the jets and the dotted curve represents the exposures having the dark surrounding area. The second set of curves marked B shows the improvement obtained when only two jet tubes per spool bank at 10 pounds pressure are used. Finally, the set of curves marked (7, with all the jets in use at 4 pounds pressure, are nearly coincident at all densities, which is the desired result for good screen quality. The effect in the magenta and yellow layers is similar although with inadequate agitation the difference is not so great as with the cyan layer. This result would be expected since the latter is at the bottom of the monopack.
Agitation is also used in the bleach, short stops, and fixer although the high pressure and frequency of jets as described for the developers is not necessary in these cases. Agitation of the short stops is very important for eliminating processing streaks and shimmer and in this installation the short stops are agitated by bubbling air through the tanks. For the bleach and fixer, single low-pressure jets without back-up rollers are located in the center of the tanks. For washing, nozzle sprays are used and have been found more efficient than full tanks.
The filters, jet and circulation pumps, air compressor, filter for the wash water, and other units are located in the basement under the machine.
The solution mixing room is located on the second floor directly above the front end of the machine. Seven stainless-steel mixing tanks, two small stoneware tanks, and a sink are located over this area with an operating platform in the center. The plumbing from these tanks to the machine is through black Seran pipe.
Six of the stainless-steel mixing tanks are used to supply the first developer, short stop, hardener, color developer, bleach, and fixer. The seventh tank is a spare connected to the color developer system. The two stoneware tanks are arranged so that they can supply solution to any machine tank through a utility line with flexible couplings.
By closing two valves the circulating pumps can be used to return the first developer, color developer, and bleach from the machine to their mixing tanks. This feature has proved expedient in experimental work and is convenient for maintenance and cleanup. In the case of the bleach, it is the most desirable procedure for carrying out the replenishment.