MISCELLANEOUS PRINTING PROCESSES) 317 
The paper should be hung up to dry. The exposure, under a 
line drawing, is from 5 to 10 minutes in diffused light, or 
until the image is distinctly visible. Immerse in water, not 
too cold, until the lines of the drawing show a distinct relief. 
It should then be surface dried with a soft pad of cloth, and 
hung up to dry. Then coat with: 
Shellac 50 g 384 gr. 
Lampblack 150 ¢ 24 oz. 
Alcohol 1000ccm 16 oz. 
The shellac should be dissolved first, filtered, and then the 
lampblack worked in. A flat brush or soft pad should be 
used for applying this to the print, which, after complete 
coating of the surface, should be immersed in a 2 to 3 per 
cent solution of sulphuric or hydrochloric acid, until on gentle 
application of a soft brush or pad the black pigment comes 
away from the ground leaving the lines of a good intense 
black. 
ANTHRACOTYPE (Sobacchi).—Well-sized paper should be 
coated with a gelatine solution: 
Gelatine 33 g 258 er. 
Water 1000 ccm 16'oz: 
Allow to soak for 15 minutes, melt at 40° to 50° C. (104° to 
122° F.), and filter. Immerse the paper for 10 minutes in 
water, then place face up on a sheet of glass, and lightly 
squeegee into contact, or a soft linen pad may be used. The 
edges of the paper should be turned up to the height of about 
lem. (3 in.) so as to form a dish, and the gelatine solution 
poured in, allowing 620 ccm per qm (2 oz. per sq. ft.). As 
soon as the gelatine has set, hang up to dry. This paper will 
keep indefinitely. To sensitise immerse for 2 minutes in a 
4 per cent solution of potassium bichromate, and dry in the 
dark ; this paper will keep for about a week. Expose under a 
drawing from 12 to 60 seconds in sunlight until the image is 
