114 ELEMENTARY PHOTO-MICROGRAPHY. 



The handling of the paper and inspection of 

 prints should be done in subdued light. After 

 printing is completed, the paper is put in a com- 

 bined toning and fixing solution until the desired 

 tone is obtained, and then is washed thoroughly 

 in running water, or by eight changes of water, 

 allowing five minutes soaking between each change. 

 Every maker of paper issues full instructions with 

 each packet, but, as nearly all differ, the reader 

 should buy a bottle of combined fixing and toning 

 solution from any photographic dealer, and simply 

 wash his prints well after they come out. If the 

 reader desires to prepare his own solution, the 

 following formula may help him : 



A GOOD COMBINED TONING AND FIXING BATH. 



Hypo . . . . . . ij ounces. 



Citric acid 20 grains. 



Acetate of lead . . . . 20 



Water . . . . . . 8 ounces. 



Dissolved in the order given, and allowed to stand 

 twenty-four hours. Pour off only the clear liquid 

 for use, and then add one grain of gold chloride 

 dissolved in a little water. 



This mixture gives a fine range of tones for 

 landscape prints, and will keep a long time. Also 

 it may be used repeatedly until exhausted. 



If the toning and fixing be not carefully 

 watched, a loss of fine detail may result, which, 



