PHOTOGRAPHIC PROCESSES. 85 



The water is poured from the plates, the developer 

 again applied, the process carefully watched, and the 

 solution poured off before any symptoms of fogging 

 appears in the whites of the negative. 



In the opposite case, where the image is slow in 

 making its appearance, the solution should be poured 

 back into the measure, and a quantity of no. I. solu- 

 tion, varying from i to double the quantity at first 

 used, added to the developer, and at once applied to 

 the plate, without previous washing. 



It will be seen that owing to the variations ad- 

 missible in the strength and preparations of the 

 solutions employed, the condition and density of 

 the negative is almost completely under control, if 

 the exposure has been kept within anything like 

 reasonable limits. 



The developer is now poured off and the plate 

 washed for a few minutes. If not sufficiently dense 

 (especially when owing to under exposure), the 

 washing is continued for some time, and the ordin- 

 ary pyrogallic acid and silver solution, mentioned 

 under the wet process, employed. 



Whether intensified or not at this stage, the nega- 

 tive is quickly washed under the tap and placed in a 

 solution, consisting of — 



Hyposulphite of Soda, J ii. 

 Water, J x. 



this solution should be fresh. 



The plate is left in it for about five minutes after 



