Very Rapid Monobath Processing

Supported by the U.S. Army under Contract DA 36-039-AMC-02357(E). M. Levy Project Engineer

paper presented at the Symposium on “Procesiing Technology” organized by the Science Committee on 12-14 May 1915, in London.

Abstract

Monobaths have been formulated in which thin, hardened, high speed films, i.e., Kodak Timing Negative, can be processed in 5 sec. at 140 F, and in 10 sec. at 120 F. The processed films exhibit speeds comparable to controls developed in D-19 at 68° F and show approximately the following characteristics: fog=0·4, gamma=1·0, Dmax=1·9. The high contrast resolution values, (in lines per mm), for 5 sec. monobath processed film are about 20 per cent lower than those of a D-19, 68 F control over the Dmax range of 0·8—1·6. At these rapid processing times, the sensitometric characteristics are strongly dependent on monobath temperature. As an example. RM-6 the monobath designed for 10 sec. processing of film at 120°F, is of a different formulation than RM-92A, designed for 5 sec. processing of 140° F. The 5 sec. monobath processing to desirable sensitometric characteristics was attained with the use of a particular ingredient. l-thiazolidine-4-carboxylic acid (TCA)^†. Analytical data have been obtained which support the conclusion that TCA decreases the processing time by acting as a fixation accelerator. Also, TCA acts as an antisludging agent that gives prolonged life to the mono bath.

Notes

Supported by the U.S. Army under Contract DA 36-039-AMC-02357(E). M. Levy Project Engineer

paper presented at the Symposium on “Procesiing Technology” organized by the Science Committee on 12-14 May 1915, in London.