Pyrogallol developer with a very small tendency for staining.
[table id=69 /]
To make Solution A, the sodium sulphite and sodium metabisulphite should be put into hot water at the same time and the solution brought to a boil. Boil for a minute or two, cool and dissolve the pyrogallol. The boiling increase the life of the solution and prevents staining.
To use, dilute 1:1:2 and develop in a tray for 4–6 minutes at 18.5°C. For a stronger negative, dilute 1:1:1 or omit water entirely.
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.