The process of developing and fixing with this solution is accomplished in a {527} few minutes. The picture first appears usually, strengthens very quickly, and shortly after the fixing is entirely done.
Ellon’s Pyrocatechin Developer.
Carbonate of potassium, 10 per cent solution (10 grams carbonate in 100 cubic centimeters of water).
For use take equal parts and add water as desired.
Imperial Standard Pyro Developer.—
| I.— | Metabisulphite of potassium | 120 grains |
|---|---|---|
| Pyrogallic acid | 55 grains | |
| Bromide of potassium | 20 grains | |
| Metol | 45 grains | |
| Water | 20 ounces | |
| II.— | Carbonate of soda | 4 ounces |
| Water | 20 ounces |
For use mix equal parts I and II.
Bardwell’s Pyro-acetone Developer.—
| Water | 4 ounces |
| Sulphite of sodium (saturated solution) | 4 drachms |
| Acetone | 2 drachms |
| Pyro | 10 grams |