Il8 ELEMENTARY PHOTO-MICROGRAPHY. 



face up, in the fixing bath made up as follows : 

 FIXING BATH FOR BROMIDE PAPER. 



Hypo . . . . . . 4 ounces. 



Water . . . . . . ib 



To this are added 



Sodium sulphite . . . . i dram. 



Acetic acid 6 drams. 



Alum i dram. 



Dissolved in ij ounces of water. 



The prints are kept moving a few moments, 

 and afterwards allowed to remain fifteen minutes. 

 An hour's washing in running water, or in eight 

 changes of water, as before described, completes 

 the process. A thorough washing should be given. 

 The above bath keeps clean much longer than a 

 simple hypo and water bath, and can be used 

 time after time until exhausted. 



If the brand of bromide paper shows blisters 

 during development, try a developer free from 

 caustic alkali. 



Platinotype printing is at once the simplest, 

 most permanent, and most effective of all pro- 

 cesses. Good negatives yield prints equal in beauty 

 to a fine steel engraving, with rich gradations of 

 tone very pleasing to behold. The whole process 

 can be completed on a bright day in a little over 

 an hour, though on dark days the printing is slow. 

 Moisture is the chief preventive of successful work ; 



