312 PHOTOGRAPHIC FACTS AND FORMULAS 
tion, otherwise a smear will be caused. At first very light 
pressure should be used and with each passage of the block 
through the machine it should be increased. The transfer 
can easily be examined by removing the top pack, lifting one 
corner of the bromoil, while holding the main part down with 
a stiff card or straight edge, and the rolling continued if the 
transfer is not enough. If a second pull is desired it is advis- 
able to free the bromoil from any trace of the ink by swab- 
bing with a solvent, such as carbon tetrachloride. It must be 
again immersed in water before inking up again. The num- 
ber of pulls possible from one bromoil varies with the hard- 
ness of the gelatine film and may be from five to twenty-five. 
ANOTHER BRoMOIL TRANSFER Process.—A direct print 
or enlargement should be developed with a non-tanning devel- 
oper, such as amidol, fixed in a plain hypo bath, well washed, 
and then bleached in the following: 
Potassium bromide 10g 77 gr. 
Cupric sulphate 15 ¢ 115.¢r. 
Potassium bichromate 5g 38.5 gr. 
Water 1000 ccm 16 oz. 
Dissolve in the above order, and add sufficient hydrochloric 
acid to form a clear solution. After complete bleaching, 
wash well, and treat with a 1 per cent sulphuric acid bath to 
remove any yellow colour. Again wash, fix in a 20 per cent 
solution of hypo, and wash. Immerse the print for 10 min- 
utes in: 
Glycerine 333 ccm 5 oz. 
Water 667 ccm 10 oz. 
Place face up on a clean glass plate, and roll down with a 
roller squeegee. Now fasten the edges down to the glass with 
strips of gummed paper. Ink up with a roller with a greasy 
ink, litho or collotype. If the paper is too much hardened, 
the ink will take on the parts which should be white; then it 
