de Cezar Popescu | apr. 1, 2012 | Desensitizers, Miscellaneous
Desensitizing is a process whereby the sensitivity of a plate or film is depressed, so that the development can take place by a brighter darkroom illumination. At the present time (1943) the following desensitizers are available: [wptabs type=”accordion”...
de Cezar Popescu | mart. 14, 2012 | Miscellaneous
These chemicals, which should be added to the developer in quantities from 0.1–0.2 grams per litre, impart to the developer valuable additional properties. They have strong anti-fogging properties. With development papers, developer improvers produce purer and deeper...
de Cezar Popescu | mart. 14, 2012 | Miscellaneous
When the developer is prepared with tap water, the solution usually appears cloudy, which fact is due to the lime salts of the water combining with alkali and forming a precipitate. This turbidity has no effect on the properties of the developer, but if the lime...
de Cezar Popescu | mart. 14, 2012 | Developers, General purpose developers
Positive developer. When a brown-tone developer of this type is used, it does not mean that brown tones will be produced on any paper; not all papers are suitable for brown tones. This developer should be used for those papers which are especially designed to produce...
de Cezar Popescu | mart. 14, 2012 | Developers, General purpose developers
This positive developer is suitable (or all papers, which are intended to give warm-black tones, e.g., chamois contact paper (gas-light), portrait contact and enlarging papers (chloro-bromide). Focal paper developer for warm-black tones, working solution Ingredient...
