An active developer formula for use on chloride contact papers to produce cold blue-black tones.
|Sodium sulfite anhydrous||40||grams|
|Sodium carbonate anhydrous||75||grams|
|Water to make||1||liter|
|Mix chemicals in order.|
Dilute one part of stock solution with two parts of water and develop prints from 1.5–2.5 minutes at 20°C.