Variation of a pyro developer with acetone.
|Mix chemicals in order.|
|Sodium sulphite anhydrous||150||grams|
|Water to make||1||liter|
For tank use, mix 12.5 mililiters stock solution with 0.58 liters of water and 31 mililiters acetone. Develop for 25–35 minutes at 21°C.
For tray use, mix 20 mililiters stock solution with 0.28 liters of water and 6.2 mililiters acetone. Develop for 4–7 minutes at 18.5°C.
As a rule, contrast and density may be increased by decreasing the recommended amount of water to dilute the stock solution by 50%–66%. Softer negatives can be obtained by using 50%–100% more water than is specified for normal results.