This formula is similar to Ansco 17 but due to the use of sodium metaborate as the alkali, permits greater variation in developing time.
|Hot water (125F or 52C)||750cc (ml)|
|Sodium Sulfite (anhydrous)||80 g|
|Sodium Metaborate||2 g|
|Potassium Bromide||0.5 g|
|Water to make||1 L|
Do not dilute for use.
Developing time at 68F (20C) 10 to 15 minutes for fine-grain films.
Larger amounts of metaborate may be used with corresponding reduction of developing time (up to 10 grams of metaborate per liter with a developing time of 5 minutes at 68F) although slightly coarser grain size will then be obtained.
From Ansco Formulas for Black and White Film by GAF, 1948