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Fig. 4. General view of vanadium processing machine.
cell in the machine need not have a very high capacity. However, if the machine were filled with unelectrolyzed developer at the start, it would require an unreasonable amount of time to bring the solution up to proper activity with the low-capacity machine cell.
Replenishment to maintain volume of solution in the system can be made with either the electrolyzed or nonelectrolyzed solution. The replenisher solution has essentially the same composition as the starting solution, with the possible exception of a slightly lower bromide concentration. At the carryout rates found on the machine, as much as 3300 ft of 35mm film can be processed in 1 liter of vanadium developer solution. The bromide build-up in the developer caused by this high processing capacity will be at least partially compensated for by the electrolysis. Bromide ion diffusing into the anode compartment of the machine cell is oxidized to bromine gas and thus removed from the system. If this is not enough, the composition
of the replenisher solution is adjusted accordingly.
Runs of up to 8000 ft have been made on the processing machine using Eastman Fine Grain Release Positive Film, Type 5302. Electrolytic regeneration of the developer was used, as already described, to maintain developer activity, and throughout the run it was possible to produce reasonably constant photographic results.
To keep a check on the developer composition during processing, an analysis procedure has been devised that requires no more equipment, time and skill than the procedure used in control analysis currently practiced by motionpicture processing laboratories.
There appears to be no necessity for special techniques in processing other than to observe the following precaution. Since the vanadium solution is very sensitive to aerial oxidation, care must be taken to prevent undue exposure to air, otherwise very rapid oxidation of the developer will occur and there will be a tendency for aerial fogging reactions.
January 1954 Journal of the SMPTE VoL 62