Many of the Edwal formulas were developed by Dr Edmund Lowe. They often contained uncommon developing agents or other chemicals. The following formula says that it produces dense blacks and is probably worth a try.
Edwal 120
This paper developer produces rich dense blacks and is useful where bold
masses of tone are desired and detail is to be suggested rather then ren-
dered with great exactness.
Stock Solution A
Distilled water (50°C) ................................. 750 ml
Sodium sulfite (anhy) ................................. 40.0 g
Catechol .................................................. 20.0 g
Distilled water to make ............................... 1.0 l
Stock Solution B
Distilled water (50°C) ................................ 750 ml
Potassium carbonate ................................. 120 g
Distilled water to make .............................. 1.0 l
Usage
For chloride and slow chlorobromide papers, mix one part of Solution A and 2
parts of of Solution B, add 15 ml of 1% benzotriazole for each liter of working
developer. For fast chlorobromide papers, mix 1 part of Solution A, 2 parts
of Solution B and 1 part of water, add 20 to 40 ml of 1% benzotriazole for
each liter of of working developer. Additional small amounts of benzotriazole
or potassium bromide may be added to produce finer detail.
Modern Developing Methods, 3rd Edition (March 1946), The Edwal Laboratories, p 73.
