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June, 1930]
STOP BATHS AND FIXING BATHS
679
1.2 cc. per liter or 0.15 oz. per gallon with the D-16 developer, and 1.8 cc. per liter or 0.23 oz. per gallon with D-76. One hundred cc. samples were taken after processing 50 feet of film and after revival. These were stored in stoppered bottles at 70° F. and their hardening properties determined at regular intervals.
The results of the tests are given in Figs. 2, 3, 4, 5, from which it is seen that with D-16 at 70°F. (Fig. 2) the hardening action of fixing bath No. I decreased from 212°F. to 190°F. after fixing 100 feet of positive film per gallon. On revival with acid the hardening
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4.0
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4.0 FIG. 2.
FIXING BATH NO. I P-Hb *7O"F R
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• RETICULATIOH
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. I WEEK.
400
300
600
700
100 ZOO JOO
Effect of exhaustion with acid revival on the hardening properties of chrome alum fixing bath No. I (D-16 developer at 70° F.).
action was restored to its original value but fell off to 160°F. after processing 200 feet per gallon. A maximum degree of hardening was again obtained after the addition of acid and again it decreased to 160°F. after processing 325 feet per gallon. The hardening properties were then restored by the addition of acid but they decreased to 150°F. on further exhaustion to 450 feet. The bath was finally exhausted to 750 feet per gallon after revival with acid at the 590 foot and 750 foot stages. A minimum degree of hardening was produced at these revival points but the hardening action increased after the addition of