processors \ processing of b&w reversal film orwo - process 4105

Processing of blank-and-white reversal films ORWO - Process 4105

(I) Steps of processing.

   Steps  Solution

Time (minutes)

Temperature (C)

1  First Developement  ORWO 829 5-7 20 0.25
2  Rinse   4 12-15
3  Bleaching  ORWO 833 2 19-21
4  Rinse   2 12-15
5  Clearing  ORWO 835 2 19-21
6  Rinse   2 12-15
7  Second Exposure  approx 8000 lxs - -
8  Second Developement  ORWO 842 2 20 0.25
9  Rinse   1 12-15
10  Fixing  ORWO 303 2 19-21
11  Rinse   6 12-15
12  Wetting  R905* (1+200) 0.5 19-21
13  Drying   - max. 40

 

(II) Formulas

ORWO 829 - First Developer
Solution 1:
1. Water (35C) ................................. 750.0 mL
2. Sodium sulphite ................................... 25.0 g
3. Phenidone ............................................. 0.2 g
4. Hydroquinone ..................................... 10.0 g
5. Sodium carbonate ............................... 20.0 g
6. Potassium bromide ................................ 6.0 g
7. Potassium thiocyanate ........................... 6.0 g


Solution 2:
1. Water (20C) .................................. 125.0 mL
2. Sodium hydroxide .................................. 5.0 g
After cooling down solution 1 pour solution 2 into it and fill up water to 1 litre.
pH = 11.2 0.1


ORWO 833 - Bleaching Solution
1. Water ............................................... 750.0 mL
2. Potassium dichromate ............................ 10.0 g
3. Sulphuric acid (conc.) .......................... 15.0 mL
4. Fill up water to.............................................1 L
pH = <1.0

 

ORWO 835 - Clearing Solution

1. Water ................................................ 750.0 mL
2. A 901** .................................................. 1.0 g
3. Sodium sulphite ...................................... 90.0 g
4. Fill up water to ............................................ 1 L
pH = 9.2 0.2

 

ORWO 842 - Second Developer
Solution 1:
1. Water (35C) ................................. 750.0 mL
2. Sodium sulphite ................................... 25.0 g
3. Phenidone ............................................. 0.2 g
4. Hydroquinone ..................................... 10.0 g
5. Sodium carbonate ............................... 20.0 g
6. Potassium bromide ................................ 6.0 g
Solution 2:
1. Water (20C) .................................. 125.0 mL
2. Sodium hydroxide .................................. 5.0 g

After cooling down solution 1 pour solution 2 into it and fill up water to 1 litre.
pH = 11.2 0.1

This developer is like first developer ORWO 829, but without potassium thiocyanate.

 

ORWO 303 - Acid Fixing Solution
1. Crystalline sodium thiosulfate ................. 400.0 g
2. Potassium bisulfite ................................... 50.0 g
3. Fill up water to ............................................ 1 L
pH = 4.4 0.2

 

Notes:

* R905 wetting agent is manufactured by Calbe Chemie under the name of Calbe F905 Netzmittel.

** A901 anticalcium agent is based on polyphosphate manufacturated by Calbe Chemie.

 

 

(III) Consulted documents: