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Sept., 1939] RCA ALUMINATE DEVELOPERS 313
same negative density, have a higher print density which would produce somewhat less background noise. In Fig. 11 the curves Al-Q show cross-modulation characteristics where the film was developed in one of the Al-Q formulas. The negative-print density difference is diminished considerably and the curves are broadened so that at a densitometric level of —36 db there is considerably greater print density tolerance. It was found that slight modifications of the developer formula could be made to broaden this density tolerance.
It should be stated specifically that all the cross-modulation tests were made on a special continuous, non-slip, non-synchronous printer in order that variations due to printer behavior might be minimized. Accordingly, the amount of improvement in cross-modulation characteristics in commercial work by use of the new developer would depend chiefly on printer quality.
SUMMARY
In many of the formulas used in the field it is necessary to dissolve the chemicals in a certain specified order. Furthermore, the mixing sometimes requires a procedure which is somewhat cumbersome and inconvenient. The new developer can be mixed in any fashion whatsoever and, if desired, the ingredients may be poured as rapidly as convenient into a tank of cold water which is being thoroughly agitated. Chemicals may even be mixed dry and dumped in bodily, although, of course, thorough agitation must also be maintained. The laboratory tests conducted thus far have indicated many desirable characteristics. Briefly, they are as follows :
(1) Long, useful life which, it is hoped, will result in substantial savings to the motion picture industry.
(2) Higher possible contrast and improved resolution for both variable-area recordings and release prints.
(5) Developing conditions with respect to effective emulsion speed, gamma, and density hold reasonably constant throughout the life of the developer.
(4) Temperature effect is reduced by 40 to 50 per cent.
(5) Density tolerances with modulated high-frequency recording are increased by approximately 100 per cent.
(6) The developer is entirely satisfactory for both sound negatives and picture positives.
(7) The developed image is hardened in the developer.
(8) The developing time of the formula as at present constituted is of the order of two minutes for picture prints and sound positives, and three minutes for variable-area sound negative. If for any reason somewhat greater optimum developing time is warranted, this can be maintained.
(9) Mixing is simple.