90 PHOTOGRAPHIC FACTS AND FORMULAS 
Sodium sulphite, dry 34 OZ. 74 02. 
Hydrochinon 90 gr. 2 OZ. 
Sodium bisulphite Y, oz. 5 oz. 
Potassium bromide 5 gr. 50 gr. 
Sodium carbonate, dry hiez. 10 oz. 
Cold water to 2 qt. OY, gal. 
B. Cold water 16 oz. YZ gal. 
Pyrogallol 45 ger. 1 oz. 
Add B to A and develop 15 to 20 minutes at 65° F., accord- 
ing to density desired. For each degree below 65° F., one 
minute should be added to the time of development chosen. 
For each degree above 65° F., one minute should be sub- 
tracted from the chosen development time, provided the bath 
is fairly fresh. 
Renewer : 
Water 32 oz. 2 gal. 
Metol 22 gr. 4 oz. 
Sodium sulphite, dry 2/5 oz. 4 oz. 
Hydrochinon 45 gr. 1 oz. 
Sodium bisulphite Y4 oz. 2Y4 02. 
Sodium carbonate, dry 2/5) az. 4 oz. 
The renewer is added from time to time to keep the developer 
even with the top of the tank and at the same time to freshen 
up the solution. A fresh bath should, however, be mixed 
up every two or three weeks at least, according to the number 
of rolls developed in the old solution. 
