To these is added bromide of potassium or ammonium, which is the restrainer, and occupies about the same position or performs the same function as acetic acid in the wet plate developer, and besides being a restrainer it greatly aids in securing intensity and printing quality; and when plates are overtimed in exposure its prompt use may result in securing a good negative.
Some plates require double the quantity of pyro that others do to produce the same quality of negative. After ascertaining the normal amount of pyro necessary to develop plates of a certain make, if it is desired to increase intensity add more pyro, if your plate is developing too intense or hard add more of the alkali.
DRY PLATE DEVELOPER, A.
No. 1.
| Carbonate of Soda (Sal) | 1 lb. |
| Carbonate of Potash | 1 lb. |
| Yellow Prussiate of Potash | 1 oz. |
| Bromide of Ammonium | 1 oz. |
| Water | 64 oz. |
No. 2.
| Pyrogallic Acid | 1 oz. |
| Saturated Solution Sulphite Soda | 15 oz. |
Keep No. 2 in glass-stoppered bottle.
To develop one 8×10 plate, take of
| No. 1 | 1 dr. |
| No. 2 | ½ dr. |
| Water | 6 oz. |