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Processing of blank-and-white reversal films
ORWO - Process 4105
(I) Steps of processing.
| |
Steps |
Solution |
Time (minutes) |
Temperature (ºC) |
| 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 (35°C) ................................. 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 (20°C) .................................. 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 (35°C) ................................. 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 (20°C) .................................. 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:
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