CHAPTER XIV. 

 DEVELOPMENT OF GELATINE-BROMIDE PLATES. 



NOKMAL DEVELOPERS. 



A. PYRO-AMMONIA. 



Pyrogallol 2 grains 



Liq. Amm. .880 3 minims 



Potassic or ammonic bromide 1 grain 



Water to 1 ounce 



B. PYRO-CARBONATE. 



1. Pyrogallol 3 grains 



Sodic carbonate 12 grains 



Water to. . . .1 ounce 



Or, 



2. Pyrogallol 3 grains 



Potassic carbonate 12 grains 



Water to 1 ounce 



Or, 



3. Pyrogallol 3 grains 



Sodic carbonate 6 grains 



Potassic carbonate 6 grains 



Water to 1 ounce 



NOTES. The reader is referred to Chapter VIII for hints as 

 to method of " stocking " the above reagents. The stock solu- 

 tions there formulated are all so-called " 10 per cent, solutions," 

 and in each case a grain or a minim may be obtained by tak- 

 ing ten minims of the stock solution. 



Thus to make the Normal Pyro- Ammonia Developer we 

 take of 



Stock pyro solution 20 minims 



Stock Ammonia 30 minims 



Stock Bromide 10 minims 



and make up with water to one ounce. 



