27 1883. PHOTOGRAPHIC NOTES. IMPROVED DEVELOPERS. Water 10 ounces. The bromine solution is first mixed with the water and then Pyrogallic acid 120 grains is added. The solution is now ready for use. Care should be taken to avoid inhaling the fumes of bromine when mixing it with water. Water . 2 ounces. Bromide of potassium . .180 grains. This solution must be kept in a tightly corked bottle. Water 20 ounces. Stock solution No. 2 3 drachms. To develop a quarter plate take seven drachms of No. 3 to which add sixty minims of No. 1; flow this over the plate; and the image will develop
27 1883. PHOTOGRAPHIC NOTES. IMPROVED DEVELOPERS. Water 10 ounces. The bromine solution is first mixed with the water and then Pyrogallic acid 120 grains is added. The solution is now ready for use. Care should be taken to avoid inhaling the fumes of bromine when mixing it with water. Water . 2 ounces. Bromide of potassium . .180 grains. This solution must be kept in a tightly corked bottle. Water 20 ounces. Stock solution No. 2 3 drachms. To develop a quarter plate take seven drachms of No. 3 to which add sixty minims of No. 1; flow this over the plate; and the image will develop gradually free from fog. A. L. Henderson of London England originator of a new formu la for cold gelatine emulsification regards the above devel oper as superior to all others for gelatine plates. A modification of the above developer has been found to work well. Two stock solutions one a saturated solution of washing or sal soda and the other a saturated solution of pure sul phite of soda in water should be made. To develop a 4 x 5 plate take: to which add ' sulphite soda 1 drachm. Bromo pyro solution No. 1 (as above) 4 drachms. Flow and develop in the usual manner. The formula may be simplified as follows : Water 32 ounces. Saturated solution sal soda . .4 ounces. sulphite soda . .4 ounces. To develop a 4 x 5 plate take ten drachms of the above t which add four drachms of the bromo pyro solution No. 1 as given above). If the plate has been under-exposed more saturated sal soda solution should be added; if over-exposed the devel oper should be immediately poured off into a measure the plate flooded with water then drained and the developer returned. diluted slightly with water and a few drops of a 10 per cent solution of bromide of ammonium added. The sired intensity. Plates developed with this developer are soft quick printing clear in the shadows and possess every good quality of a wet plate. The emplokment of sal soda as a developing agent has the advantage over ammoni
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