With this negative developer formula the following types of finegrain developer may be made up:
- Without potassium sulphocyanide it provides a normal fine grain developer, and about 50 per cent additional exposure of the negative is recommended.
- Without potassium sulphocyanide but with double the quantity of sodium carbonate (2 grams), it provides a rather more brilliant working fine grain developer than the foregoing one and the same increase in exposure is required (50 per cent).
- Exactly as given in the formula it is a super-finegrain developer somewhat slow and soft-working. Double normal exposure is advised.
- With potassium sulphocyanide and double quantity of sodium carbonate it is a super-finegrain developer, giving somewhat steeper gradation than 3. Double normal exposure time.
| Ingredient | Quantity | |
|---|---|---|
| Metol | 3 | grams |
| Sodium sulfite anhydrous | 90 | grams |
| Borax crystals | 1 | gram |
| Sodium carbonate anhydrous | 1 | gram |
| Glycin | 5 | grams |
| Potassium sulphocyanide | 1 | gram |
| Potassium bromide | 0.5 | grams |
| Water to make | 1 | liter |
| Mix chemicals in order. | ||
Making up: Prepare with warm water and dissolve in the order given. It is essential that the glycin is added only after the sulphite and alkali, otherwise it will not dissolve.
Replenisher formula:
| Ingredient | Quantity | |
|---|---|---|
| Metol | 5 | grams |
| Sodium sulfite anhydrous | 90 | grams |
| Borax crystals | 2 | grams |
| Sodium carbonate anhydrous | 4 | gram |
| Water to make | 1 | liter |
| Mix chemicals in order. | ||
Dilution: The solution is prepared ready for use. The replenisher is employed when the developer is used in tanks, and serves to keep the volume and properties uniform throughout the useful life of the developer. The replenisher should be added so that the level of the solution in the tank remains constant. As a rule each film absorbs and takes with it about 3 mililiters of developer solution.
Times of development: For version 1 and 2: 10–15 minutes, according to the desired contrast. For versions 3 and 4: 15–20 minutes, according to desired contrast.
Keeping qualities and use: During use, the developer becomes turbid through precipitated silver, but this has no effect on the properties of the developer. Should a deposit settle on the film surface, such may be easily removed before drying by a film wiper, viscose sponge, or similar utensil.