188 PHOTOGRAPHIC FACTS AND FORMULAS 
darker than the finished prints are required to be. Place, 
without washing, directly in the baths, which should be at 
18° C. (65° F.), and keep constantly in motion. 
For sepia tones: immerse for 10 minutes in a 10 per cent 
solution of hypo. 
For brownish-black tones: immerse for 10 minutes in a 
10 per cent solution of common salt; then transfer direct to 
the same strength hypo solution. 
For dark brown tones: immerse in: 
Hypo 100 g 2 oz. 
Salt 100 g 2 oz, 
Water 1000 ccm 20 oz. 
Variation in tones from light to dark brown is obtained by 
decreasing or increasing the quantity of salt in the above bath. 
As soon as the desired tone is obtained, the prints should be 
carefully washed by repeated changes of water, or in run- 
ning water for 30 minutes. The most satisfactory method of 
drying is to place the prints between clean blotters. 
GEVAERT Ronix SetF-Tonine PApEer.—This is a collodio- 
chloride paper. Print a little darker than the finished print is 
desired to be. For sepia and brown tones, wash prints for 
three to five minutes in 2 or 3 changes of water, immersing 
them face down to prevent curling. Fix for 10 to 15 min- 
utes in: 
Hypo 100 g 2 oz. 
Water 1000 ccm 20 oz. 
Wash for one hour, blot off surplus water, but do not dry 
between blotters. For dark brown and blue tones, wash as 
before and then immerse for 5 to 10 minutes in: 
Salt 100 g 2 oz. 
Water 1000 ccm 20 oz. 
Rinse, fix and wash as for sepia tones. Baths should be used 
only once, 
