88 PHOTOGRAPHIC PROCESSES. 



too acid, carbonate of potash may be added to nutral- 

 ize the excess. The solution is now securely corked* 



No. II. Sulphate of Iron, 3 n i- 

 Distilled Water, J vi. 



This solution is also securely corked. 



Suppose we wish to develope a quarter plate; 

 four parts or 3 viii of no. I. solution are placed in a 

 glass measure, and one part or 3 ii of no. II. solu- 

 tion are added; not vice versa, or a precipitate of 

 oxalate of iron is formed which weakens the mix- 

 ture. One or two drops, according to circumstances, 

 of the bromide of ammonia solution, the same as 

 that used as a restrainer in alkaline, pyro developer 

 is added to the whole. The plate is placed in the 

 vulcanite dish, the developer caused to wave to and 

 fro over its surface, till the required density is ob- 

 tained; the same precautions as those previously 

 mentioned with regard to fogging, etc., being ob- 

 served. 



After development the mixed solution is trans- 

 ferred to a separate bottle holding about eight or 

 ten ounces; when full, this is boiled in an iron sauce- 

 pan for ten minutes, returned to the bottle and 

 securely corked ; it will answer admirably for the 

 development of several future plates or paper pic- 

 tures, if always boiled after use, and the clear liquor 

 poured off. * 



Fixing and subsequent intensification are pro- 

 ceeded with in exactly the same way as for the 

 other processes. 



