100 PHOTOGRAPHIC FACTS AND FORMULAS 
Especially suitable for black and white line work. The fol- 
lowing also is excellent for the same purpose: 
A. Hydrochinon 8.5 ¢g 
Potassium metabisulphite 8.5¢g 
Potassium bromide 2.0¢ 
Water 1000 ccm 
B. Caustic potash I7 g 
Water 1000 ccm 
Mix in equal parts. 
65 gr. 
65 gr. 
16 gr. 
16 oz. 
131 gr. 
16 oz. 
For very fine grained images, add 50 to 300g (384 gr. to 
514 0z.) of ammonium chloride to every liter (160z.) of 
normal hydrochinon developer. 
Rapid acting, soft-working developer (Lainer) : 
A. Hydrochinon 10¢g 
Sodium sulphite, dry 20 g 
Potassium ferrocyanide 120 g 
Water 1000 ccm 
B. Caustic potash 50 g 
Water 1000 ccm 
77 gr. 
154 gr. 
922 gr. 
16 oz. 
384 gr. 
16 oz. 
For use mix 10 parts A with 1 part B. Development will be 
completed in about one minute. If caustic soda is used, the 
ferrocyanide may be reduced to one-fifth. For general use 
it is better to mix the developer with an equal volume of 
water. 
One solution developer (Lainer) : 
Sodium sulphite, dry 752g 
Hydrochinon 50 g 
Potassium ferrocyanide 175 ¢ 
Caustic potash 165 g 
Water 1000 ccm 
For use dilute with 4 parts of water. 
576 gr. 
384 er. 
1344 gr. 
1267 gr. 
16 oz. 
For Eastman Motion Picture Film, Negative and Pos- 
itive.— 
