. Elementary and dental radiography . n: Mercuric l)ichloride 200 grains ( grammes) Potassium Bromide 120 grains ( grammes) Water (SA ounces U^> ) Keep the plate in this solution a short time, when it will be observed to be bleached uniformly white (the longer the negative is bleached the denser it will ultimately become). Remove from the bleaching solution. wash in running water for a few minutes, then blacken in the following solution : Sodium Sulphite 1 ounce (30 grammes) Water 4 ounces (120 grammes) Or Ammonia 20 minims (1 ) Water 1 ounce * Electro-Therapeutics and Roentg
. Elementary and dental radiography . n: Mercuric l)ichloride 200 grains ( grammes) Potassium Bromide 120 grains ( grammes) Water (SA ounces U^> ) Keep the plate in this solution a short time, when it will be observed to be bleached uniformly white (the longer the negative is bleached the denser it will ultimately become). Remove from the bleaching solution. wash in running water for a few minutes, then blacken in the following solution : Sodium Sulphite 1 ounce (30 grammes) Water 4 ounces (120 grammes) Or Ammonia 20 minims (1 ) Water 1 ounce * Electro-Therapeutics and Roentgen Rays. Kassaban. 82 ELEMENTARY RADIOGRAPHY It is now being blackened, the negative is again washed, then should be done in a subdued light—not in bright daylight. An old negative, one which has been made for some time, may beintensified by first soaking in water, then following the technic given. Prepared reducers and intensifiers, with directions for their use, maybe purchased at any photographic supply Fig. 77. Showing how the printing frame is held up to the light to expose the photographicpaper. Also showing the back of the printing frame, the frame half open, and the photographic paper in position. While reducers and intensifiers have their place in dental radiog-raphy, they are used only to correct mistakes, and they do not entirelycorrect the mistakes. It is usually expedient to make a new negativerather than to attempt to reduce or intensify a faulty one. Round transparent spots on the negative are caused by air bubbles,or air /bells, as they are called, attaching themselves to the emulsionside of the plate while in the developer. Spots of irregular size and character appearing on a negative aredue often to the use of an old developer. In radiographic work, wherethe appearance of a spot may determine a diagnosis, it is to be hoped thatfresh developer will always be used. By fresh developer I mean de-veloper not, at most, over a month or so
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