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

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494 J. I. CRABTREE AND H. D. RUSSEU, [J. s. M. p. K. properties of the two acids with respect to the photographic properties desired, acetic acid would appear more suitable because it is less 2.0 % CHROME. AL.UM O.I 70 SULPHURIC AC\P X 7* MQ. Z6 NEUTRAL. AL.KM.INE1 o - O ---- tJOQ o o o -g— -ff-^ 8 MELTING PO\NTS KFTE.R MELTING, POINTS AFTER O 6 10 O 5 10 FIG. 5. Effect of the addition of MQ-25 developer on the hardening properties of a 2 per cent chrome alum stop bath containing 1 cc. of sulfuric acid per liter.. dissociated and does not tend to precipitate sulfur from hypo as readily as sulfuric acid. However, because of the prevailing preference for sulfuric acid in chrome alum baths, the effect of both of the above acids was determined.