The Dark Room: Developing and Printing 61 



solutions will act upon a very much hardened 

 film. 



When the negative is too thin from under 

 development or under exposure it may be inten- 

 sified, but not until after it has been thoroughly 

 washed. The Agfa intensifier, which comes al- 

 ready prepared, is the most convenient and gives 

 as good results as any. Intensification can be 

 carried as far as desired and a negative may be 

 reintensified several times, but it must be entirely 

 free from hypo, or else again we will have result- 

 ing stains. Where there is a loss of detail from 

 under exposure, if it cannot be brought out by 

 developing in a weak developer, then intensifica- 

 tion will do no good but only serve to make it 

 harder. We can bring out what is in a negative 

 and force it up to a good printing quality, but we 

 cannot put into it what is not already there. 



Of the local manipulation of plates in develop- 

 ment, reduction, and intensification, I shall say 

 nothing, as the nature photographer will have 

 but little recourse to this, and when he does the 

 knowledge of how to do it will best come to him 

 through experience. In fact, in all the processes 

 of photography a little of this kind of knowledge 

 is worth much advice. 



Great care should be exercised in the develop- 

 ment of the orthochromatic plates, especially the 

 fast ones, to expose them to even the ruby light 



