60 PRACTICAL PHOTOMICROGRAPHY. 



For printing on gelatino-chloride emulsion paper (" Aristo- 

 type"): 



Ammonic sulpho-cyanide. 1 ounce 



Sodic sulphate 1 ounce 



For printing on bromide paper, transferotype (Eastman), 

 and for certain lantern-slide plates : 



Ferrous sulphate (protosulphate of iron) pound 



Potassic oxalate .1 pound 



Acetic acid (glacial at 52 deg. F.) 1 ounce 



* Sulphuric acid, good comm'l 1 ounce 



* Sodic chloride (common salt) 1 pound 



Pure talc or " French chalk " (for transferotvye) 1 ounce 



For the wet plate collodion process either for negatives or 

 for making lantern slides, a quantity of each of the following : ' 

 Collodion iodized, or with separate iodizer ; solution for clean- 

 ing glass plates; argentic nitrate; f distilled or pure rain 

 water ; ferrous sulphate in addition to the above, also acetic 

 acid or nitric acid ; sodic hyposulphite extra; or potassic cyanide. 



For all negative processes : hard varnish, 5 ounces. 



For all lantern slides : cold " crystal" varnish, 5 ounces. 



These quantities are small, but will suffice for a start, and 

 they are arranged as above so that the reader need not amass 

 a large collection of chemicals for processes he does not pro- 

 pose to work. 



* These may be useful for all processes, and may be stocked in larger 

 quantity. 



f Necessary for almost all processes, and may be stocked in bulk. 



