DEVELOPERS oe 
Mix well and add gradually: 
Potassium carbonate 500 g 5 oz. 
Water to make 750 ccm 7Y OZ. 
Carbonic acid is given off and a thin cream formed, which 
must be well shaken and mixed with 12 times its volume of 
water before use. 
Glycin-soda.— 
Glycin I5¢ 115 gr. 
Sodium sulphite, dry S7:5)S 288 gr. 
Sodium carbonate, dry Soh fss 422 er. 
Water 1000 ccm 16 oz. 
Glycin-potash (Hubl).— 
Potassium metabisulphite 175g 202z., 384 gr. 
Caustic potash 175g 20z., 384 gr. 
Glycin 120 g O22 et: 
Water 1000 ccm 16 oz. 
Mix 1 part with 25 parts water. 
HyprRocHINON.—One solution: 
Sodium sulphite, dry 37.5 g 288 gr. 
Hydrochinon 10g 77 ot. 
Sodium carbonate, cryst. 150 g 1152 or: 
Hot water 1000 ccm 16 oz. 
Two solution: 
A. Hydrochinon 25¢ 192 gr. 
Sodium sulphite, dry 50 g 384 gr. 
Water 1000 ccm 16 oz. 
B. Potassium carbonate 10 per cent solution 
Mix 2 parts A with 1 part B. 
One solution: 
Hydrochinon l5¢ [f5,er. 
Sodium sulphite, dry 150 ¢ 1152 gr. 
Formaldehyde 20 ccm 154 min. 
Water 1000 ccm 16 oz. 
