104 PHOTOGRAPHIC FACTS AND FORMULAS 
Sodium bisulphite Og Y4 oz. 
Hydrochinon tog 34 OZ. 
Sodium carbonate, dry 3g LY oz. 
Potassium bromide 0.4 g 95 gr. 
Water to 1000 ccm 512 07 
Temperature 18° C. (65° F.). Development from 10 to 14 
minutes. The following strengthening solution may be used 
to keep the volume and strength up to standard: 
Elon (metol) 0.75 ¢ 85 gr. 
Sodium sulphite, dry 23.52 6 oz. 
Sodium bisulphite 0.5 ¢ 55 gr. 
Hydrochinon 15g 170 gr. 
Potassium bromide 0.4¢ 45 gr. 
Water to 1000 ccm 256 oz. 
To give this stock solution greater keeping quality, the sodium 
carbonate is not added until the strengthening solution is 
used. For use dissolve 1 part of sodium carbonate, dry, in 
32 parts of the above solution. 
Standard Postcard Plates.— 
Elon (metol) a2 Y, oz. 
Sodium sulphite, dry 31.25'5 4 oz. 
Hydrochinon 782 1 oz. 
Sodium carbonate, dry 47g © 6 oz. 
Potassium bromide 195 g 4 oz. 
Water 1000 ccm 128 oz. 
For use mix with an equal volume of water. 
Stanley Plates—For these plates the following metol- 
hydrochinon developer is recommended : 
Elon (metol) roe Ma 30 gr. 
Sodium sulphite, dry S125 4 oz. 
Hydrochinon 3.9¢ 30 gr. 
Sodium carbonate, dry 15.625 g V4 OZ. 
Water 1000 ccm 16 oz. 
