PEAT INO TY Es 289 
C. Ammonia iron alum 100 g 768 gr. 
Hydrochloric acid 100 ccm 768 min. 
Water 1000 ccm 16 oz. 
For use add 5ccm (35 min.) A to 1000 ccm (16 0z.) water, 
fren 2 cam) (14 min.) B, and; finally, 5 ccm (35 min.) €. 
Both these baths, particularly the uranium, intensify the 
prints. 
The catechu toning process (Packham) gives warm brown 
tones, but it is difficult to keep the whites pure; on the other 
hand, this is rather effective than otherwise, as the print ap- 
pears as if prepared on toned paper. A stock solution is 
prepared of: 
Catechu 78¢ 600 gr. 
Water.” 1000 ccm 16 oz. 
Boil for 5 minutes in a glass or porcelain vessel, and add: 
Alcohol 200 ccm 3 1/5:0z 
For use mix: | 
Stock solution Pe) CSO 20 min. 
Water , 1000 ccm 16 oz. 
When used cold, this takes some hours to tone, but, by rais- 
ing the temperature to 55° to 64° C. (130° to 147° F.), only 
about 15 minutes is necessary. Should the whites be stained, 
and it is desired to remove this, soak in: 
Castile soap 9g 69 gr. 
Sodium carbonate, cryst. 18g 138 er. 
Water 1000 ccm 16 oz. 
When the stain is reduced, wash and dry. 
Copper Toninc (Menke)—Four stock solutions are re- 
quired : 
A. Cupric sulphate A4lg 38.5 gr. 
Water 1000 ccm 16 oz. 
B. Potassium ferricyanide Ses 274 er. 
Water 1000 ccm 16 oz. 
