File:Anthony's photographic bulletin for (1896) (14595322470).jpg

Identifier: anthonysphotogr1896newy (find matches)
Title: Anthony's photographic bulletin for ..
Year: 1870 (1870s)
Authors:
Subjects: Photography
Publisher: New York : E. & H.T. Anthony & Co.
Contributing Library: University of Illinois Urbana-Champaign
Digitizing Sponsor: University of Illinois Urbana-Champaign

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red fog might lead to mistakes. A fewwords about the appearance may therefore not be out of place : Immediately after exposure—therefore in wet condition—the unex-posed parts have a faint yellow coloration. Later on they will changeto a dark red. Formerly I was of the opinion that the light was thecause of it by reason of the decomposition of the bromide of silver,which can never be completely removed by fixing, but in fact it isonly a consequence of the drying of the film. If the dried negative ismoistened again later on, it will become light yellow again, the sameas before. This red fog can be removed by a short treatment with bromide ofcopper and the fixing bath, or with Farmers reducer. It is sometimessufficient to leave the plate for several hours in the fixing bath. Thebromide of silver remaining underneath the film will then also dissolve. Mercury Intensifier.—The intensification takes place after bleachingwith bichloride of mercury and the treatment with ammonia, in the
Text Appearing After Image:
Photo by J. Byron. A LIVING POSTER. 354 ordinary way. Strange to say, it is here also not easy at first to keepthe high lights completely clear. After washing, the usual time afterbleaching—about an hour—a white cloudiness will appear in the film.The same is only at the places which should be glass-clear, not at thedark ones. It is mercury amide, which formed by the action of ammoniaupon some bichloride of mercury which remained. Rubbing withthe finger is sometimes sufficient to remove the same. If it is in thefilm, however, nothing is known by which it can be removed. R. Ed. Liesegang.Translated by Henry Dietrich. —<&&.■— DARKROOM ILLUMINATION. k k A \ rH EN we come to consider the colors of non-actinic glass as used\ \ for darkroom illumination, it is necessary to remember that thereare two distinct methods of imparting color to glass, viz., either by addingthe coloring principle to the molten mass, as in pot-metal, or by merelygiving a superficial coating, as i

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