Energetic positive developer giving vigorous results. Producing pure black to blue-black tones on chloride paper, and pure black tones on bromide enlarging paper.
| Ingredient | Quantity | |
| Mix chemicals in order. | ||
| Metol | 2 | grams |
| Sodium sulphite anhydrous | 25 | grams |
| Hydroquinone | 6 | grams |
| Sodium carbonate anhydrous | 37.5 | grams |
| Potassium bromide | 0.5 | gram |
| Water to make | 1 | liter |
Do not dilute as solution is ready for use.
Times of development:
- For contact printing papers (gas-light): 45–60 seconds.
- For enlarging papers (chloro-bromide and bromide): 1.5–2 minutes.
Keeping qualities and use: The solution keeps well and is very economical in use.
Note: To increase the capacity of the developer for blue-black tones on contact printing papers (gas-light), and pure black tones on enlarging papers (bromide), add a developer improver.