336 PHOTOGRAPHIC FACTS AND FORMULAS 
SoLaR PRINTING.—Frequently used for making enlarge- 
ments with plain surfaces for working-up with crayon, water 
colour and oils: 
Potassium iodide fobs 125 gr. 
Ammonium bromide Jae 50 gr. 
Ammonium chloride 2g 16 gr. 
Gelatine 12.5 2 96 gr. 
Albumen 110 ccm 134 oz. 
Water 1000 ccm 16 oz. 
Soak the gelatine in three-fourths of the water for 30 min- 
utes, melt in a water bath, add the salts, cool down to about 
38° C. (100° F.), add the albumen, which should have been 
previously whipped to a froth and allowed to liquefy, and 
add enough water to make up to bulk. Apply to the paper 
with a sponge or Blanchard brush, and dry. Sensitise with: 
Silver nitrate 100 g 1Y4 oz. 
Glacial acetic acid 50 g 34 OZ. 
Water 1000 ccm 16 oz. 
Apply with sponge or brush, and dry. The exposure with a 
good light will be about 60 seconds. The developer is: 
Gallic acid 12.5 ¢ 96 gr. 
Lead acetate 22g 16 er. 
Water | 1000 ccm 16 oz. 
Add just before use a little of the silver nitrate solution. 
Apply with brush or sponge. Or: 
Milk 1000 ccm 16 oz. 
Glacial acetic acid 38 ccm 288 min. 
Stir well, filter, and add to the filtrate: 
Potassium iodide 14.5 g 112 gr. 
Potassium bromide Se 27 gr. 
Paint over the paper, and dry quickly. To sensitise, float on 
or paint with: 
Silver nitrate 84 ¢ 642 gr. 
