A well known paper developer by Kodak, D72 provides good contrast with selected papers.
|Sodium sulfite anhydrous||45||grams|
|Sodium carbonate monohydrate||80||grams|
|Water to make||1||liter|
|Mix chemicals in order.|
If sodium carbonate anhydrous is available, use 67.5 grams instead. Place the warm water in the storage container and add a pinch of sodium sulfite. Reduce the amount of potassium bromide and/or substitute 0.2 g of benzotriazole for every 1.0 g of potassium bromide for cooler blue tones.
Dilute 1:1 and develop for 1 minute at 20°C. For warmer tones on bromide papers, dilute 1:3 or 1:4, add 8 ml 10% potassium bromide for each liter of working solution and develop for 1.5 minutes. Normal development time is 2 minutes for paper, 4 minutes for film. Increasing dilution lowers contrast. Increasing or decreasing development time will increase or decrease contrast. For fast chloride papers such as Velox, dilute 1:1 and develop 45s at 20°C. For chloride papers such as AZO, dilute 1:2 and develop 45s at 20°C. For bromide papers dilute 1:4 and develop no less than 90s at 20°C.
Stock solution in full stoppered bottle keeps 6 month. Partially-filled bottles: 2 monts. Diluted in tray: 24 hours. Diluted in tank: 1 month.
Useful capacity: 12–18 8×10″ per liter of developer.
Also known as DuPont Du53D.