76 ELEMENTARY PHOTO-MICROGRAPHY. 



HYDROKINONE DEVELOPER. 



A. 



Hydrokinone . . . . 80 grains. 



Potassium bromide . . 15 



Sodium sulphite . . . . i ounce. 



Water . . . . . . 10 ounces. 



B. 



Sodium hydrate . . . . 50 grains. 



Water . . . . . . 10 ounces. 



Equal parts of A and B are taken to make one 

 ounce of developer. 



Hydrokinone is a developer that answers equally 

 well with ordinary plates, lantern plates, and 

 bromide prints ; and after the beginner has ob- 

 tained some proficiency, he may find it a conveni- 

 ence to have only one developer instead of several. 



