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) |
| Metol | 1.5 g |
| Sodium Sulfite (anhydrous) | 80 g |
| Hydroquinone | 3 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
