3 C ; OF. PHOTO MICROGRAPHY 



. . Hypo , . . ; .. , : i oz. 



Water 4 ozs. 



Ferricyanide potass. C. P. . . . . 10 grs. 



Take each print separately from the water, 

 and, holding it in one hand, with the other go 

 over it very carefully with a moderately large, 

 round camel's hair brush filled with the re- 

 ducing solution, taking care not to get this 

 over the margin of the print during the oper- 

 ation. A very little practice will render one 

 expert in this, and the marks will disappear 

 like magic. Running water should be al- 

 lowed to wash over the face of print fre- 

 quently, in order to prevent any action of 

 the reducer upon the print itself, should some 

 accidentally get upon it. Final washing and 

 drying, as usual, must follow. 



Since the above paragraph was written, I 

 have had an opportunity of using another 

 brand of paper, possessing all of the good 

 features of Velox, with the additional one of 

 an entire absence of the surface markings, 

 which are such a disagreeable feature of the 

 latter, the sole drawback to its use indeed 

 that I have found. This is the S-C-P or 

 "Slow Contact Paper" of Wellington & Ward, 

 England. It has the same perfect surface as 

 the Velox, the same sensitiveness and is de- 



