The Dark Room: Developing and Printing 69 



always give yourself ample time for what you have 

 to do. Mix your solutions with care and exact- 

 ness, and unless your water supply is fairly pure, 

 it should be distilled. After mixing a solution 

 always filter before using it, for there is much dirt 

 that remains in it that might injure the negative ; 

 and, above all things, be cleanly in all your opera- 

 tions. 



