OZOUY EE. AND ALLIED PROCESSES ') (299 
Oxalic acid 20 g 154 gr. 
Water 1000 ccm 16 oz. 
For use mix 150 parts with 850 parts of water, and add 1.2 
parts citric acid. This last addition is not essential, but it 
keeps the whites cleaner. In this acid bath the tissue should be 
allowed to remain not longer than 7 to 15 seconds, then drawn 
once or twice over the surface of clean water, and squeegeed 
into contact with the wet bromide print. The two should be 
left under light pressure for about 15 minutes, and can then 
be developed like an ordinary carbon print with water at 
407 to 45 CG. (104° to 113° F.). Then the print should be 
fixed in hypo and ferricyanide to remove the silver, washed, 
and dried. In this case, the bromide print forms the basis of 
the carbon print. In the alternative or transfer process, the 
bromide print is stripped from the pigment tissue, the latter 
squeegeed into contact with transfer paper, and developed 
as usual. The procedure is precisely the same up to the point 
of development. At this point, the print and the adherent 
tissue are immersed in water for 1 minute, the print pulled 
off, and immersed in a dish of water. The carbon tissue is 
squeegeed into contact with transfer paper, which has been 
soaked in water for about 15 minutes, and then treated as in 
the carbon process. The bromide print should be well washed 
for 30 minutes, then immersed in daylight in an ordinary 
developer until fully developed, then washed, and dried. It 
can be repeatedly used in this way. It is obvious that en- 
largements may be treated in this way. 
CarBro Process.—This is practically the ozobrome pro- 
cess. Iwo stock solutions are required: 
A. Potassium bichromate 50 ¢ ] oz. 
Potassium ferricyanide 50 g 1 oz. 
Potassium bromide 50 g oz: 
Water 1000 ccm 20 oz. 
