This section is from the book "Complete Self-Instructing Library Of Practical Photography", by J. B. Schriever. Also available from Amazon: Complete Self-Instructing Library Of Practical Photography.
The Second Transfer. Different grades of final paper supports can be purchased already prepared for use. If you prefer any special support, such as Whatman's paper, it must be coated with the following preparation:
Chrome Alum .....................................................
286. In an earthen or granite dish soak the two ounces of gelatin in the sixteen ounces of water, for from four to six hours; then dissolve by gentle heat. When thoroughly dissolved, add 6 drams of B in four ounces of warm water. Stir the gelatin (A) constantly while adding the alum (B) diluted with warm water. Then filter, after which the solution is ready for use.
287. This preparation must be applied to the paper while warm and may be put on with a soft sponge; or the solution poured into a large tray and the paper floated on this the same as when coating the temporary support. The application with the sponge is the most simple, however, and therefore is recommended. After the paper is coated hang it up to dry, allowing the film to thoroughly harden. When dry and you are ready to make your double transfer, it is advisable to again coat the paper with this warm solution. Then place this prepared paper upon the image which has been developed upon the temporary support and squeegee into perfect contact. Finally hang it up to dry. When thoroughly dry, but not before, with the blade of a pen-knife separate the papers at one corner. Then take these corners, one in each hand, and separate the two pieces, one from the other.
288. As the ready-prepared second transfer paper (final support) can be purchased either in rolls or cut sheets from any dealer in photographic supplies, you will find it cheaper, and time saved, to purchase the support already prepared. When using the prepared stock one is apt to experience difficulty in determining which side of the paper is prepared, as both sides look alike when wet. It is advisable, therefore, before immersing the paper, to mark, with a pencil, on the outside of the roll, which is the back. This will enable you to easily distinguish the prepared from the plain side in subsequent operations. The face side is smooth and tacky, the back more gritty.
289. The final support should be trimmed as much larger than the temporary support as the temporary was larger than the carbon tissue.
290. Having cut the final supports to the required sizes, immerse them singly in clean water, 100° Fahr., the prepared side down. The immersion must be gentle, in order to avoid bubbles. If any of them appear, more especially on the prepared side, expel them with the camel's-hair brush, for wherever these bubbles appear they will prevent the paper from absorbing the moisture, and when the print is transferred to the support there will be blisters where these bubbles were not removed. Allow the sheet to remain in the water until it becomes semi-transparent, or thoroughly saturated, and the prepared side is covered with minute bubbles, which will appear in about three minutes. At this time the sheet must be withdrawn from the water (by taking hold of the two nearest corners) and placed on the carbon image, which has been previously placed face side up on the squeegee plate, or some smooth surface. Begin with the lower edge, gradually lowering until the whole is in contact; then cover the back with rubber cloth and apply the squeegee to expel all air bubbles and surplus moisture. After this is accomplished lay a dry blotter over the print and mop thoroughly, after which hang up to dry. When thoroughly dry, separate the two supports as previously instructed.
CHUMS. Study No. 6-See Page 356. Mrs. W. W. Pearce.
291. In order to save time, when there are many prints to transfer, instead of transferring them from the temporary support while the developed image is still wet, the prints may all be developed on the temporary support, fixed in the alum bath and washed in clean, cold water and hung up to dry. Any time after they are thoroughly dried they may be transferred to the final support. When ready to transfer, place one or two prints at a time in clear, cold water and allow them to remain until the paper is thoroughly soaked; then remove one of them to the squeegee plate, face up. Having previously cut the final supports to the required sizes, immerse a sheet in warm water, 100° Fahr., until the bubbles appear and the paper becomes semi-transparent. Next, place it upon the developed image, as previously described. Then carefully squeegee with considerable pressure in order to make an even transfer. After mopping off with a clean, dry blotter, hang up to dry, after which separate as previously instructed.