The DARKROOM COOKBOOK, Third Edition

Formulas 227
Sodium hydroxide, 17.6 g
Potassium bromide, 9.0 g
Benzotriazole, 0.2 g
Water to make 1.0 liter
For temperatures down to 30F/�1C, use the above formula undiluted.
For temperatures down to 5F/�15C, use 3 parts stock solution, 1 part ethylene glycol.
The ethylene glycol should be added prior to storage at low temperatures.
NOTE: This formula may give fog or excessive contrast with some negative materials.
Caution: Dissolve the sodium hydroxide in a small volume of water in a separate container
before adding it to the solution of the other constituents
FORMULA #42
Kodak SD-22
Amidol–pyrocatechin
SOLUTION A
Water at 125F/52C, 500.0 ml
Sodium bisulfi te, 100.0 g
Amidol, 40.0 g
Pyrocatechin, 40.0 g
Benzotriazole, 2.0 g
Water to make 1.0 liter
SOLUTION B
Water at 125F/52C, 500.0 ml
Sodium hydroxide, 120.0 g
Potassium bromide, 20.0 g
Potassium iodide, 4.0 g
Water to make 1.0 liter
Combine Solutions A and B immediately before use, since the mixed developer oxidizes rapidly.
Solution A may also deteriorate on keeping and should be kept well-stoppered and as
cool as possible.
For use down to 30F/�1C, mix 1 part Solution A, 1 part Solution B, and 2 parts water.
For use down to 5F/�15C, mix 1 part Solution A, 1 part Solution B, 1 part water, and
1 part ethylene glycol.
For use down to �40F/�40C, mix 1 part Solution A, 1 part Solution B, and 2 parts
ethylene glycol.
NOTE: The glycol may be divided and added to each of these solutions before storing at low
temperatures.