212 PHOTOGRAPHIC FACTS AND FORMULAS 
4 drops saturated solution potassium bromide. Temperature 
21° C. (70° F.). Prints must be exposed so that the time of 
development will be not less than 45 seconds for No. 1 or 
30 seconds for No. 2. For commercial and amateur print- 
ing, the following is recommended: 
Elon (metol) 0.73 g 7 gr. 
Sodium sulphite, dry 13g 110 gr. 
Hydrochinon 3.6 ¢g 30 gr. 
Sodium carbonate, dry 18 ¢ 150 gr. 
Potassium bromide, sat. sol. 0.5 ccm 5 drops 
Hot water 1000 ccm 20 oz. 
memperature 21° C).(70"-F2): 
DEFENDER COMMERCIAL PAPER.— 
Metol 0.77 g 15 Sr: 
Sodium sulphite, dry 25° 1 oz. 
Hydrochinon og 60 gr. 
Sodium carbonate, dry 18g ¥ Oz. 
Potassium bromide, sat sol. 8 drops 10 drops 
Water 1000 ccm 40 oz. 
d@emperature, 18°C, (65° F.). 
DEFENDER VELOUR BLACK.— 
Metol 154¢ 30 gr. 
Sodium sulphite, dry 12.5¢ Y4 oz. 
Hydrochinon 4¢ 80 gr. 
Sodium carbonate, dry | Page YZ oz. 
Potassium bromide, sat. sol. 512 drops 600 drops 
Water 1000 ccm 40 oz. 
For commercial use: 
Metol lg 20 gr. 
Sodium sulphite, dry 12-312 Y, oz. 
Hydrochinon 3g 60 gr. 
Sodium carbonate, dry 18.75 ¢ 34, OZ. 
Potassium bromide lg 20 gr. 
