CHAPTER XI. 
DEVELOPMENT OF THE PLATE. FIXING. 
1 VJ OT wishing to create confusion in the mind of the 
1 ^ beginner, we shall confine attention to three de¬ 
veloping agents ; these varying in their characteristics 
only slightly, but still to such an extent that it may be 
said that one developer is on the whole more suitable 
for a given kind of work than another. 
Hydroquinonc , or Quinol , is our favourite for general 
work, especially where we wish good contrast between 
object and background. 
Pyrogallot falls little short, if at all, of quinol for all¬ 
round work; but contrast is not so much a characteristic 
of the former as of the latter. 
Metol is a developer using which we may give short 
exposures, and get considerable contrast; for objects 
presenting in themselves considerable contrasts this 
will be found an excellent reagent. 
The Pyrogallol Developer. 
Dissolve 4 ozs. avoir, of pure sodium sulphite in 
about 8 ozs. of distilled water, when dissolved add 120 
grains of citric acid, and pour into a commercial ounce 
bottle of pyrogallol, make up to g ozs. Filter and 
label “ Pyro, 10 per cent.” 
