THE GUM-BICHROMATE PROCESS Za7, 
smell distinctly, and then heat to drive off excess of ammonia. 
Beat the whites of several eggs to a froth, and allow to 
stand for 24 hours to liquefy. The pigmenting solution is: 
Bichromate sol., above 450 ccm 74 02. 
Cupric sulphate 90 g 720 gr. 
Gum arabic, powdered 800 ¢ 13% oz. 
Pigment 600 g 10 oz. 
Albumen 200 ccm S/S); 0z: 
Glycerine 100 ccm 768 min. 
Mix well, and apply as usual to the paper. 
