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.
Temperature Of Room. Do not work in a cold room; the temperature should not be under 60° Fahr.
Developing The Print. The development on glass is about the same as the flexible support. Place the glass bearing the tissue in a hot water bath of 100° to 110° Fahr., having the film side up. Spray the hot water over the film, continuing until the paper is washed off. Don't catch it by the corners, as in the case of flexible support, as the paper will wash off of its own accord in a very few minutes. When it becomes thoroughly loosened it can be removed without any pulling or injuring of the film. After the paper is removed, continue to spray the plate or keep it in motion under the water until the image becomes clear and clean. It is then placed in the alum bath and fixed for ten minutes. After fixing, the plate is again rinsed in cold water and placed in the rack to dry.
Transferring From Glass To Final Support. For the final support, heavy-weight paper is recommended, or two thicknesses of the medium weight.
325. The glass bearing the dry image is placed in a tray of cold water for a few seconds, after which it is laid on a table or some flat surface. Then place a sheet of heavy support (or if medium support is used, use two sheets) in a hot water bath, 120° Fahr., face down. If any bubbles arise on back before the surface becomes semi-transparent, expel them with the camel's-hair brush which has been previously made wet. In from three to five minutes the paper will become transparent and covered with air-bubbles. At this stage, withdraw it from the hot water and apply the support to the glass, gelatin side in contact with the image. Now, cover with the rubber cloth, and with the squeegee expel all air-bubbles and water.
326. If the medium-weight paper is used, apply the second sheet over the first in a like manner, squeegeeing in perfect contact; then place in a rack to dry. When thoroughly dry, insert a knife point under one corner of the paper, when it will readily strip from the glass.