84 PHOTOGRAPHIC PROCESSES. 



This solution will keep for some time if the bottle 

 containing it is securely corked. Care should be 

 taken that the ammonia is the full strength specified, 

 if weaker the whole formula will be ruined. 



No. II. Pyrogallic Acid, 4 grs. 

 Water, 2 oz. 



This solution should be mixed immediately before 

 development. 



The plate or plates being removed from their re- 

 spective slides, are placed in the ebonite dish. 



An equal quantity of no. I. solution is added to 

 no. II., and the whole poured equally over the plates 

 which are left at rest in it. 



As it would be difficult to weigh a less quantity of 

 pyrogallic acid, and as the resulting solution is far 

 too large a quantity for a single quarter plate, we 

 recommend the development of at least four at the 

 same time. 



Should the picture flash out suddenly after the 

 application of the developer, over exposure is 

 indicated ; the developer should be immediately 

 poured back into the measure, the plates washed for 

 a second or two under the tap, and left covered with 

 water in the dish while one or two drops of a solu- 

 tion, 



Bromide of Ammonia, ^j. 

 Water, 3j. 



are added to the developer. 



