PHOTOGRAPHIC PROCESSES. 87 



No. I. Pyrogallic Acid, 3 i. 

 Glycerine, 3 i. 

 Methylated Alcohol, 3 vi. 



Mix the glycerine and alcohol, then add the acid. 



No. II. Bromide of Ammonia, gr. 1\. 

 Liquor Ammonia # 880, 3 i 

 Glycerine, 3 i. 

 Distilled Water, 3 vi. 



Add one part of each to fifteen parts of water and 

 use in equal proportions. 



These solutions will keep a long time if well corked. 



Ferrous oxalate or Eder's developer on account of 

 its simplicity and cleanliness, has, lately become a 

 favourite with amateurs. It possesses few other ad- 

 vantages except that it can be used side by side with 

 the wet process, an impossibility where ammonia is 

 given off, as it contaminates the atmosphere of the 

 dark room. 



The following solutions are used : — 



No. I. Neutral Oxalate of Potash, 3" vi. 

 Boiling Water, | xx. 



Place the oxalate of potash in an earthenware 

 vessel and add the boiling water, stirring with a glass 

 rod till sufficiently cool to be poured into the bottle 

 intended for its reception. If on testing with red 

 litmus paper the solution is found to be alkaline, 

 sufficient dilute sulphuric acid is added to cause a 

 very faint acid reaction with blue litmus paper. If 



