THE CARBON PROCESS 256 
matt surface glass be used; if polished opal be used, a high 
gloss is obtained: 
Pyroxyline 8.5 ¢g GaleT: 
Alcohol 500 ccm 8 oz. 
Ether 500 ccm 8 oz. 
OpaL Gtass, Ivory or Woop as FINAL SuPPORT.—Coat 
with the chrome gelatine mixture given above under single 
transfer paper. For canvas, the surface paint should be 
removed by scrubbing with hot soda solution, about 10 per 
cent, until nothing but the priming is left. Paint freely with 
the chrome-gelatine mixture, dry thoroughly, rub down 
smooth with fine sandpaper, and repeat the operations about 
four times. The print should be finally soaked in the gelatine 
solution, and squeegeed into contact. 
SUBSTRATUM FOR TRANSPARENCIES.—FEither of the fol- 
lowing may be used: 
Gelatine 40 g 307 er. 
Water 1000 ccm 16 oz. 
Potassium bichromate 4g 31 gr. 
Coat the glass thinly, dry, and expose to light for 30 minutes; 
then wash and dry. Or the glass may be coated with the 
following, which keeps well: 
Gelatine 7g 54 er. 
Glacial acetic acid 34 ccm 260 min. 
Water 270 ccm ATZ oz. 
Dissolve by heat, and add slowly: 
Alcohol 680 ccm ioz: 
Phenol (carbolic acid) 10 ccm 77 min. 
Then add, with constant stirring: 
Chrome alum Cys & 534 gr. 
Water 14 ccm 107 min. 
To INTENSIFY CARBON TRANSPARENCIES.—Immerse in: 
