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20 Cards in this Set
- Front
- Back
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exposed crystals become a ______ grain when developed
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black
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film processing
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exposed crystals are converted into atomic silver
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steps in developing
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wetting, developing, stop bath, fixing, washing, drying
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wetting
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swells the emulsion to permit chemical penetration
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developing
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produces a visible image from the latent
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stop bath
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terminates development & removes excess chemicals from emulsion
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fixing
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removes remaing silver halide from emulsion & hardens gelatin
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washing
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removes excess chemicals
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drying
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removes water & prepares radiograph for viewing
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what is the principle action of developing is to
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change the silver ions of the exposed crystals into metalic silver
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the developer supplies a ____ to the ionic silver
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electron
Ag+ (+) e- = Ag |
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an unexposed silver halide crystal has a _______ charge
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negative charge on its surface
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an exposed silver halide crystal ______
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a negative charge on its surface except for the sensativity area
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where can the developer only enter the crystal
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exposed sensativity area
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development depends on what factors
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crystal size, developer concentration, temp.
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after development the exposed crystals are destroyed what remains
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a grain of blakc metallic silver
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the developer contains what buffering agents
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sodium carbonate & sodium hydroxide (alkali compounds)
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what restrianers are in the developer
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potassium bromide & potassium iodide (reduces reaction to exposed crystals only)
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what does the preservative in the developer do
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controls oxidation of the developer by air (sodium sulfite)
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what does the hardner do
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control swelling & softening of the emulsion (glutaraldehyde)
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