238 PHOTOGRAPHIC FACTS AND FORMULAS 
Thiocarbamide-sulphide (Triepel) — 
Potassium bromide 10g 77 gr. 
Potassium ferricyanide l5¢g 115 gr. 
Sodium sulphide 4g 31 gr. 
Thiocarbamide 2¢g 15.5 gr. 
Caustic soda 2¢ 15.5 gr. 
Water 1000 ccm 16 oz. 
InpirEcT Processes.—The bleaching bath may be made 
either with a bromide, chloride or iodide. The correct 
formula for the bromide is: 
Ammonium bromide lig 85 gr. 
For the chloride 
Salt 6.6 g 50 gr. 
For the iodide: 
Potassium iodide 18.6 g 143 gr. 
Each should be added to: 
Potassium ferricyanide sae 269 gr. 
. Water 1000 ccm 16 oz. 
If the halide salts be used in the above quantities, there is no 
loss in the intensity of the images, which will be the case if 
they are used stronger. The above may be kept as stock 
solutions. The following gives a somewhat colder sepia than 
the above: 
Potassium ferricyanide 6g 46 er. 
Ammonia 15 ccm 115 min. 
Water 1000 ccm 16 oz. 
Various modifications have been suggested, as: 
Potassium ferricyanide 23 ¢g 177 gr. 
Potassium iodide l4¢ 107 gr. 
Ammonium persulphate l4g 107 gr. 
Water 1000 ccm 16 oz. 
Or: 
Potassium iodide 23 g 177 gr. 
