70 SCIOPTICON MANUAL. 



ALKALINE SOLUTIONS. 



Carbonate of Ammonia, 64 grains. 



"Water, 1 ounce. 



Bromide of Potassium, 4 grains. 



"Water, 1 ounce. 



Mix together. 



After the plate is well washed, flow over it a solu- 

 tion of 



Pyrogallic Acid, 2 grains. 



Water, 1 ounce. 



Then pour back again into the measure. Should the 

 image be developed by this solution, proceed very cau- 

 tiously, and add a few drops of the alkaline solution of 

 carbonate of ammonia and bromide of potassium. If 

 the picture comes out slowly, add more of the alkaline 

 solution up to thirty drops, if necessary, and also a suf- 

 ficient amount of stronger pyro to bring out all the 

 detail. When the image is out, wash with water, and 

 intensify with 



Pyrogallic Acid, 2 grains. 



Water, 1 ounce. 



To which is added ten drops of citric acid and nitrate 

 of silver solution. 



Citric Acid, 30 grains. 



Nitrate of Silver, 20 " 



Water, 1 ounce. 



This is a stock-bottle. Mix in separate glasses ; add 

 together and filter; wash. 



FIXING SOLUTION. 



Hyposulphite of soda. 



TONING SOLUTION. 



The same remarks applied to wet positives will answer 

 for toning dry plates. 



