642 HANDBOOK OF PHOTOGRAPHY 



preliminary soaking in plain water for at least 5 min. and then placed, gelatin side up, 

 on a sheet of plate glass. It is preferable to place over the paper a piece of a damp 

 blotter to maintain the paper in a moistened condition throughout the various 

 transfers. 



The magenta-dyed relief is removed from the acidulated water bath and placed 

 image face down on the prepared paper. Holding one edge of the film with fingers 

 to prevent sliding, the surplus water and air bubbles are expelled by going over the 

 film with a flat squeegee a few times in both directions with increasing pressure. The 

 contact between the relief film and the transfer paper must be intimate. The sand- 

 wich can now be covered with another sheet of plate glass and allowed to remain in 

 this manner for a time which might vary from 10 to 30 min., depending on the strength 

 of the relief image. 



The transfer of the dye can be expedited by increasing the pressure and keeping 

 the sandwich warm. This can readily be done by placing some additional weight over 

 the plate glass and covering with towels dampened in hot water. 



The relief film should be left in contact with the transfer paper long enough to 

 allow a complete transfer of the dye. When this is accomplished, the film is peeled 

 off the transfer paper and put away to dry or replaced in a magenta dye tray if addi- 

 tional prints are to be made. Without giving the transfer paper a chance to dry, a 

 thin sheet of Kodaloid or celluloid shovild be dampened and placed directly over the 

 transfer paper. On top of the Kodaloid place the second relief film stained in the 

 blue-green dye. 



The Kodaloid sheet should not be placed entirely over the magenta image, but a 

 small safe margin at the extreme left should be left exposed to permit holding down 

 in contact the blue-green relief and the transfer paper, still permitting the Kodaloid 

 sheet to be pulled off when the right registration is accomplished. In this manner the 

 registration can be carried out with plenty of time without any danger of the blue- 

 green dye transferring out of the register and blurring the results. When one is satis- 

 fied with the registration, the blue-green relief should be clamped down on the 

 extreme left edge with fingers and then the right-hand edge bent back to allow 

 the removal of the Kodaloid sheet, after which the blue-green relief is allowed 

 to fall down in contact with the transfer paper. The surplus water and any air 

 bubbles are squeegeed off rapidly with increasing pressure, as was done with the first 

 transfer. 



The time of transfer for the blue-green image is about 10 to 30 min., depending on 

 the pressure applied and the temperature. 



The transfer of the j^ellow dye is accomplished in identical manner, although the 

 time required for the yellow transfer is appreciably less than for the other two colors. 

 When the yellow relief is removed from the transfer paper, the final color print should 

 be dried quickly to preserve the sharpness of the image. 



The following formulas for the developing of the relief images, the bleaching and 

 the fixing bath are those recommended by the Eastman Kodak Co. and it is advisable 

 to follow them very closely. 



Developer (Formula DK-oO) 



Water (about 125°F.) (52°C.) 04 oz. 2 1. 



Elon 145 gr. 10 g. 



Sodium, sulphite (desiccated) 4 oz. 120 g. 



Hydroquinone 145 gr. ' 10 g. 



Kodalk 1 oz. 145 gr. 40 g. 



Potassium bromide 29 gr. 2 g. 



Cold water to make 1 gal. 4 1. 



Without dilution, develop 5 min. at 65°. 



