Transactions of the Society of Motion Picture Engineers (1929)

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Fixing Batlis — Crahfrec and Harl 37' and (c), the quantity of sulfite which it was necessary to add to this mixture to prevent the precipitation of sulfur from the hypo in the presence of the acid. EFFECT or Soi^lUM SULPHITE *««> ACETIC ACID \ 1 OH TMC I i PROPERTIES o^ FIXING BATHS j \ I * '.C^. A 'l.S9i/ / \ POTASSIUM ALUM 0.5 Y. SODIUM SULPHITE X % ACETIC ACID [GL] YV. HVPO 3 O % ^■3. OX \1.S% ACETIC ACID Figure 4. Effect of the addition of sodium sulfite and acetic acid the properties of a fixing bath containing 0.5% potassium alum. L ■ I EFFtCT 4^ SOPIUM SULPHITE ^i*o /i ' \ y / -'\-^^^ vj"07i I 3.oy POTASSIUM ALUM 1.0% SODIUM SULPHITE X% ACETIC ACID [GlJ V/4 HVPO -^OY» \l.5% ACETIC ACID 3.0/i ACETIC ACID \3.0X \ \ \ --0 u-X r -o L 1.6 2.0 2.-4 Z.e 3.-* 3.6 PERCENT SODIUM SULPHITE Figure 5. Effect of the addition of sodium sulfite and acetic acid on the properties of a fixing bath containing 1.0% potassium alum.