Society of Motion Picture Engineers : incorporation and by-laws (1929)

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Fixing Baths — Crahtrcc mid Bart 579 slightly as the temperature of the fixing bath increases. The time of fixation also affects the hardening produced as indicated by Fig. EFFECT o-^ TEMPERATURE o^ FIXING BATH ON HARDENING PROPERTIES FIXED 15 MINUTES IXEO 5 MINUn POTASSIUM AUUM 3.0% SOUPHITC l.*V. ACETIC ACID [SLJ 1.0 V, 30 -*0 70 _ , 60 rCMPCI^ATURE [•^] Figure 6. Effect of temperature of a fixing bath on its hardening properties. 7. The age of a potassium alum-acetic acid fixing bath previous to use, has little or no effect on the hardening properties as is likewise EFFECT or AGE ^1 FIXING BATH ON HARDENING PROPERTIES T/ME HARDENING CURVES , ^^^,^-=^::r^ — ' . Hoo^ .rv^a -'--^-^-^^^-:;^e,s ^, ,,, ^,„„, ■ .■^■^' FORMULA CONTAINING ACETIC ACiD Figure 7. Effect of age of fixing bath on its hardening properties shown by Fig. 7. The quantity of alkali .in the film when placed in the fixing bath also affects the hardening produced as indicated.