9-24 Process ECP-2E Specifications
Note: See Chemical Supplies and Substitutions for calculations regarding raw chemical concentrations and alternatives.
• 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 temporary
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 a deficiency of chelating agent.
• A pH correction can be made using sulfuric acid or potassium carbonate. Do not use phosphoric acid or strong bases such as
potassium or sodium hydroxide after ferric nitrate addition.
• 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.
• 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
Potassium “UL” Bleach
Water 21-38°C (70-100°F) 700 mL 700 mL
Proxel GXL 0.07 mL 0.07 mL
KOH (45%)
*
* DO NOT add more potassium hydroxide after ferric nitrate is added.
84 mL
KODAK Chelating Agent No.1 (PDTA) 54 g 60 g
KBr or NaBr 92 g or 78 g 92 g or 78 g 101 g or 86 g 101 g or 86 g
Acetic Acid 13.5 mL 15 mL
Ferric Nitrate (Nonahydrate)
†
†See Chemical Supplies and Substitutions for possible chemical alternatives.
63 g 70 g
Water to make 1 L 1 L
pH at 25.0°C (77.0°F) 5.30 ± 0.20 5.30 ± 0.20
Specific Gravity at 25.0°C (77.0°F)
‡
‡ Adjust pH with glacial acetic acid, pota ssium carbonate, or 7.0N sulfuric acid.
1.131 ± 0.003 1.142 ± 0.003
Total Iron 9.0 ± 0.5 g/L 10 ± 0.5 g/L
Ferric Iron 9.0 ± 0.5 g/L 10 ± 0.5 g/L
Ferrous Iron <0.5 g/L <0.5 g/L
Constituent Fresh Tank Fresh and Seasoned Tank
Analytical Specifications Fresh
Replenisher Replenisher Analytical
Specifications
Ferricyanide Bleach (SR-27) (SR-27R)
Water 32-43°C (90-110°F) 900 mL 900 mL
Potassium Ferricyanide (Anhydrous)
*
* One gram of this compound can also be obtained by mixing 0.41 gram of potassium persulfate and 1.47 grams of sodium ferrocyanide decahydrate.
The reaction between potassium persulfate and sodium ferrocyanide takes about 1 hour, after which the final adjustments to the mix should be made.
30.0 g 30.0 ± 5.0 g/L 49.0 g 49.0 ± 2.0 g/L
Sodium Bromide (Anhydrous) 17.0 g 17.0 ± 2.0 g/L 26.0 g 26.0 ± 2.0 g/L
Water to make 1 L 1 L
pH at 25.0°C (77.0°F)
†
† Adjust to proper pH with 2.5 N sodium hydroxide of 2.5 N sulfuric acid.
6.5 ± 0.5 8.0 ± 0.3
Specific Gravity at 25.0°C (77.0°F) 1.027 ± 0.003
(fresh) 1.043 ± 0.003