298 PHOTOGRAPHIC FACTS AND FORMULAS 
Potassium bichromate 6g 46 gr. - 
Potassium ferricyanide 6g 46 gr. 
Potassium bromide 6g 46 gr. 
Alum 32g 23'Btp 
Citric acid lg 7 gr. 
Water 1000 ccm 16 oz. 
Or (Schmidt) : 
Potassium bichromate 8g 61 gr. 
Potassium ferricyanide 10g 7/7 gr. 
Potassium bromide 72g 54 gr. 
Alum lg 7.7 gf. 
Citric acid 0.5¢ 3.8 oF: 
Water 1000 ccm 16 oz. 
Or (Faworski) : 
Potassium bichromate 8.3 g 64 gr. 
Potassium ferricyanide 6.6 g 51 gr. 
Potassium bromide 6.6 g 51 oe 
Chrome alum 3g 23 gr. 
Citric acid lg 7.7 gr. 
Water 1000 ccm 16 oz. 
In hot weather the addition of 1 per cent of magnesium 
sulphate to the above baths is advantageous; or of (Namias) : 
Chromic acid 5¢g 38.5 gr. 
Potassium bromide 20 g 154 gr. 
Water 1000 ccm 16 oz. 
The bromide print should be immersed in cold water for 10 
minutes, and placed face up on a sheet of glass. The pig- 
ment tissue should be soaked in 1 part of the ozobrome solu- 
tion diluted with from 4 to 5 parts of water for 2 to 3 min- 
utes, and then transferred to an acid bath. This is preferably 
kept as a stock solution: 
Chrome alum 100 g 768 gr. 
