the tissue is suddenly placed in hot water, and swells into bubbles under the film of India-rubber. If the tissue is immersed for a few minutes, first in cold water, previous to development, face up, the air is expelled by the water in minute globules, and blisters avoided.
Do not be in too great haste to separate the picture.
The immersion in water also removes the chromate from the paper, which thus becomes insensitive to light, and permits the development to be made in the daylight.
It is not found best to use a brush on the surface of the newly-developed print. It endangers the whites. Moving it dexterously back and forth in the water, face up, will remove all the superfluous carbon.
Better to gradually increase the temperature of the water during development, than to have it too hot at first, and have to decrease it. Do not, however, increase the temperature too rapidly, or uneven development and blisters will occur.
The addition of half a drachm of balsam of fir to the pint of “hydrocarbon varnish,” shaking it repeatedly during the day, will secure greater adhesive qualities.
The felt cloth used should be thick, of close texture, and soft.
Mr. W. J. Kuhns announces, that by simply washing the print with aniline colors before transferring, almost any tone or color may be given the print, and with beautiful results.
Liesegang recommends protecting the prints with a thin film of plain collodion.
