Process ECP-2E Specifications 9-23
Alternate Process Bleaches
Note:
• It is especially important to follow the Good mixing practices: when preparing this bleach.
• Follow exactly the mix order given above.
• Check the solution pH before starting the ferric nitrate addition. It should be between 8 and 8.5; adjust if necessary.
• Add the ferric nitrate solution slowly while mixing.
• The solution should be clear and yellow after completion of the ferric nitrate addition and subsequent mixing. A temporarily
cloudy solution caused by too low a pH will clear during pH adjustment.
• A solution which stays red for a long time after mixing indicates an excess of iron or deficiency of chelating agent.
• A pH correction can be made using sulfuric acid or ammonium hydroxide. Do not use phosphoric acid or strong bases such as
potassium or sodium hydroxide.
• When processing more than one tank turnover of VISION Premier Color Print Film, be sure to monitor the retained silver in the
image area D-max.
Constituent Fresh Tank Fresh and Seasoned Tank
Analytical Specifications Fresh
Replenisher Replenisher Analytical
Specifications
UL Bleach
*
or “UL House” Bleach
*
* This formulation for bleach replenisher and tank can also be used as a “house” bleach for Process ECN and Process ECP. The rate of replenishment
would be adjusted for each process to arrive at the appropriate tank concentrations for each constituent. The starting point replenishment rate
recommendations for Process ECN and Process ECP are 200 mL/L and 400 mL/L respectively.
Water 21-38°C (70-100°F) 700 mL 700 mL
Proxel GXL 0.07 mL 0.10 mL
Ammonium Hydroxide Solution (28%)
†
† You can substitute ammonium acetate for ammonium hydroxide and acetic acid. See Chemical Supplies and Substitutions .
54 mL 64 mL
KODAK Chelating Agent No.1 (PDTA) 44.8 g 51 g
Ammonium Bromide (NH4Br) or
SodiumBromide (NaBr) 23.8 or 25 g 23.8 or 25 ± 3 g/L 30.7 or 32.3 g 30.7 or 32.3 ± 3 g/L
Acetic Acid Solution (90%) 10 mL 14.5 mL
Ferric Nitrate (Nonahydrate)
‡
‡ When using 35% solution by weight, use 70.5 g/L in Tank, and 80.2 g/L in Replenisher.
53.8 g 61.2 g
Water to make 1 L 1 L
pH at 25.0°C (77.0°F)
§
§ Adjust pH using glacial acetic acid, 7.0 N sulfu r ic acid, or 20% ammonium hydroxide.
5.30 ± 0.20 5.30 ± 0.20
Specific Gravity at 25.0°C (77.0°F) 1.056 ± 0.003 1.066 ± 0.003
Total Iron 7.50 ± 0.50 g/L 8.20 ± 0.50 g/L
Ferric Iron 7.50 ± 0.50 g/L 8.20 ± 0.50 g/L
Ferrous Iron <0.5 g/L <0.5 g/L