| Home
| Photography Home | Formulae
|
Bauchet B&W Reversal Processing
| First Developer | ||
| Part A | ||
| Sodium Sulphite (anh) | 50 g | |
| Hydroquinone | 15 g | |
| Sodium Carbonate (anh) | 10 g | |
| Potassium Bromide | 8 g | |
| Water to | 955 ml | |
| Part B | ||
| Sodium Hydroxide | 19g | |
| Water to | 50ml | |
| Mix Parts A + B before use | (1 litre) | 19 Parts A + 1 Part B |
| Bleach Bath | ||
| Water 750ml |
||
| Potassium Dichromate | 6 g | |
| Sulphuric acid (conc) - see note | 10 ml | ADD THE SULPHURIC ACID DROP BY DROP TO THE 750ml WITH CARE. |
| Water to | 1 litre | |
| Clearing Bath | ||
Sodium Sulphite (anhyd) |
100 g | |
| Water to | 1 litre | |
| Second Development | ||
| Metol | 2 g | |
| Sodium Sulphite (anhyd) | 10 g | |
| Hydroquinone | 6 g | |
| Sodium Carbonate (anhyd | 25 g | |
| Potassium Bromide | 2 g | |
| Water to | 1 litre | |
| First Developer | 20°C (68°F) 4-14 minutes however 8-10 minutes is a more appropriate starting point | |
| Wash | 5 mins | |
| Bleach | 3 - 5 minutes | |
| Wash | 5 minutes in running water | |
| Clearing Bath | 3 minutes | |
| Wash | 30 sec6nds | |
| Re-exposure | Expose 1 min 75 watt bulb at 5ft/1.5 metres |
|
| Second Development | To Finality (approx £ mins) | |
| Wash | 30 seconds | |
| Fixer | Fix in normal acid fixing bath. | |
| Wash | 15 - 30 mins | |
| British Journal Photographic Almanac 1947 |