12 PHOTOGRAPHIC FACTS AND FORMULAS 
Alcohol 17 ccm 285 min. 
Distilled water to 100ccm 30z., 250 min. 
B. Sugar 10g 165 gr. 
Distilled water 50 ccm 845 min. 
Tartaric acid, cryst. lg 15.4 gr. 
Boil for 5 minutes, cool and add: 
Alcohol 18 ccm 304 min. 
Distilled water to 100ccm 30z., 250 min. 
For every 100 ccm silvering solution take: 11 ccm solution I. 
(186 min.), remove 4 ccm (68 min.), and dilute with 15 ccm 
(250 min.) distilled water; add to the 7 ccm, while shaking, 
ammonia III., until just clear; then, while shaking, add 10 
ccm (169 min.) solution II., and again, while shaking, add 
enough ammonia to just redissolve the precipitate. Finally, 
add the diluted 4 ccm of solution I., obtaining a sherry- 
coloured, opalescent liquid. Filter and dilute to 78 ccm 
(2 oz., 358 min.). Mix 11 ccm (186 min.) of IV. with 
11 ccm distilled water, add to the sherry-coloured silver solu- 
tion, and pour immediately on the glass, which should be 
from 3° to 6° C. (5° to 10° F.) warmer than the solution. 
Rock vigorously, and silver for two and a half times the time 
observed from pouring on the mixed solutions until deposi- 
tion commences. Rinse twice in distilled water, swab under 
a tap, blot off the surface water, allow to dry half an hour in 
a warm place, and polish off the slight bloom. 
The Rochelle Salts Process——Two solutions are required 
for this: 
A. Silver nitrate 10¢g 77 gr. 
Distilled water 1000 ccm 16 oz. 
B. Silver nitrate 2g 15.4 gr. 
Rochelle salts 1.66 ¢ IZ ae 
Distilled water 1000 ccm 16 oz. 
In making this solution the water should be brought to a boil, 
