COLOR PHOTOGRAPHY 



643 



Wash-off Relief Bleaching Solution (Formula R-10) 



Stock Solution A 



Water U> oz. 



Ammonium bichromate 290 gr. 



Sulphuric acid (c.p.) (E. K. Co.) 4 cc. 



Water to make 32 oz. 



Stock Solution B 



Sodium chloride (table salt) l,'-2 oz. 



Water to make 32 oz. 



For use, take one part of A, one part of B and six parts of water. 



Nonhardening Fixing Bath (Formula F-24) 



Water (about 125°F.) (52°C.) 16 oz. 



Hypo 8 oz. 



Sodium sulphite (desiccated) 145 gr. 



Sodium, bisulphite 365 gr. 



Water to make 32 oz. 



500 cc. 

 240 g. 



10 g. 



25 g. 

 11. 



Acid Hardening Fixing Bath (Formula F-5) 



Water (about 125=F.) (52°C.) 80 oz. 2.5 1. 



Hypo 2 lb. 960 . g. 



Sodium sulphite desiccated 2 oz. 60 . g. 



Acetic acid (28%) 6 oz. 190.0 cc. 



Boric acid, crystals 1 oz. 30 . g. 



Potassium alum 2 oz. 60 . g. 



Cold water to make 1 gal. 4,01. 



Aluminum Sulphate Solution for Mordanting Paper (Formula M-1) 



Solution A 



Aluminum sulphate 6 J^ oz. 200 g. 



Water to make 32 oz. 11. 



Solution B 



Sodium carbonate (desiccated) 1 oz. 145 gr. 40 g. 



Water to make 16 oz. 500 cc. 



Add B slowly to A, stirring well during the addition. A white precipitate is at 

 first formed, but this dissolves upon stirring. If a trace should remain, it can be 

 filtered out with a rapid filter paper. 



5 Per Cent Sodium Acet.\te Solution 



Dissolve sodium acetate (anhydrous) 50 g. in 950 cc. water, 



Or dissolve sodium acetate (anhydrous) 1?-^ oz. in 32 oz. water. 



Pinatype Process. — Gelatin has the property of absorbing some type of dyes in a 

 manner inversely proportional to its degree of hardness. This property can be 



