ENLARGING oar, 
Glacial acetic acid 126 ccm 2 oz. 
Water 1000 ccm 16 oz. 
Develop with: 
Pyrogallol 6.25 g A8 er. 
Glacial acetic acid 83 ccm 640 min. 
Citric acid 0.13 ¢g ons 
Water 1000 ccm 16 oz. 
Or coat with: | 
Arrowroot 20 g 154 gr. 
Potassium iodide 10 ¢ 7/ gr. 
Salt 30 g 230 gr. 
Citric acid lg 8 er. 
Water 1000 ccm 1G/oz: 
Heat the mixture until a clear liquid is formed, and float the 
paper, or paint the solution on with brush or sponge. Dry. 
Float the paper for 5 minutes on: 
Silver nitrate Ths) 576 gr. 
Citric acid ae 38 ger. 
Water 1000 ccm 16 oz. 
Expose until the outlines appear, and float on: 
Gallic acid 2¢g 15 er. 
Glacial acetic acid 10g 77 gr. 
Water 1000 ccm 16 oz. 
When the image is dense enough, float the print on repeated 
changes of water, and fix in a 20 per cent solution of hypo. 
CASEIN Paper.—Dissolve as much fresh casein as possible 
in 100 ccm of strong ammonia, precipitate with dilute hydro- 
chloric acid, press the mass through linen, allow to dry, and 
powder it: 
Casein, as above 300 to 400g 5to6% oz. 
Water 1000 ccm 16 oz. 
Boil until dissolved, and add: 
Boric acid ll.5g 88 gr. 
