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DRY PLATES, FILMS AND PAPERS
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the developer so that the light will not affect the plate when once it is safely in the solution.
Whichever of these methods is adopted, some device such as a suitable changing bag, or a dark room, is required when the plate is introduced into the developer.
The introduction of tabloid developers and other photographic chemicals has been a great boon to those who prefer to develop their own plates or films, and are in the habit of carrying camera appliances with them on their holiday or other excursions. The outfits of this kind now supplied by several makers are so complete that the entire requirements of the photographer, so far as chemicals are concerned, can be comfortably carried in the coat pocket.
The new Rytol tabloids of Burroughs Wellcome & Co. are a good illustration of these developers. The tabloids are easily soluble in cold water, and one tabloid of Rytol makes four ounces of developer.
Not only are there tabloids for developing, but there are others for fixing, intensifying and reducing plates or films, and toning tabloids for P.O. P. and bromide papers. A good idea of the compact nature of the tabloid outfit can be obtained from fig. 83.
Intensification. — Sometimes it is found desirable to intensify a negative which is too thin for the purpose for which it is intended. During the process of intensification the opacity of the negative is increased either by the increase in the amount of silver deposited, or by the addition of some other more or less opaque substance to the exposed
Fig. 83.