64: PRACTICAL PHOTO-MICROGRAPHY. 



A and B will keep a long time if separate, but mixed 

 they will not keep. For precautions in mixing see /ater. 



SOLUTIONS FOR PRINTING PROCESSES. 



SENSITIZING BATH FOR ALBUMENIZED PAPER. 



Argentic nitrate 40 to 65 grains 



Water, distilled 1 ounce. 



For the ammonio-nitrate process, and for full instructions 

 on this entire subject, the reader is requested to consult " The 

 Processes of Pure Photography," by Professor W. K. Burton, 

 C. E., and the present writer. (New York : The Scovill & 

 Adams Co.) 



TONING SOLUTIONS FOR ALBUMENIZED PAPER. 



Sodic acetate 25 grains 



Auric chloride (Terchloride of gold) 1 grain 



Water 8 ounces 



Used alkaline. 



TONING SOLUTION FOR CHLORIDE EMULSION PAPER. 

 See publication as above. 



FIXING SOLUTION FOR ALL SILVER PRINTING PROCESSES. 

 Hypo 1 part 



SOLUTIONS FOR PLATINOTYPE PRINTING. 



a. A saturated solution of potassic oxalate. See above. 



b. Hydrochloric acid, 1 part ; water, 60 parts. 



c. The same as b. 



Solutions for developing lantern slide plates of various 

 kinds will be found tinder the heading appropriate to them in 

 Chap. XXII on lantern slides. 



