Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

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694 J. I. CRABTREE AND H. D. RUSSELL fj. S. M. P. E. made with motion picture positive and negative film developed in D-16 and D-76 which was rinsed before placing in the fixing bath, while in the case of the chrome alum fixing bath the film was not rinsed before immersing in the fixing bath. The effect of the addition of D-16 developer to the potassium alum fixing baths F-l and F-2 and the chrome alum fixing baths No. I and No. II is shown in Fig. 7. The procedure for the hardening tests was similar to that given on page 675. The addition of developer to a fixing bath corresponds to an exhaustion without acid revival with unrinsed film and with motion picture positive film developed in D-16. Five per cent of D-16 is equivalent to processing 100 feet per gallon. FIG. 6. Effect of exhaustion on the hardening properties and clearing time of potassium alum fixing bath F-2. Bath was revived at intervals with acetic acid and hypo. With the potassium alum baths (Curves A and B) the hardening action increased as the quantity of developer increased, until 10 per cent of D-16 was added which caused an immediate precipitation. After standing for one day, both baths containing 7.5 per cent of D-16 sludged, which indicates that the life of the fresh bath is slightly less than 150 feet of film per gallon. With the fresh chrome alum baths (Curves C and D) the hardening properties of No. I fell off rapidly after the addition of 7.5 per cent of D-16, while the hardening action of No. II did not decrease until