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Darkroom Ch 10 assignment
Terms in this set (30)
What is the cause of a pi line artifact on a radiograph?
dirt on the processor roller
What is the correct sequence of steps in the automatic processor?
Name the parts of fixer solution.
clearing agent, hardener, activator, preservative, solvent
Which component of the developer prevents overswelling of the emulsion?
What is the proper wattage for a safelight bulb?
How long does an automatic processor take?
What is a densitometer?
A device that measures a tiny are of light on the film to determine the optical density of the film
What are the three measurements made for processor evaluation?
base + fog, speed index, contrast
What is the storage temperature for film?
50-70 degrees Fahrenheit
What controls the amount of replenisher added in automatic processing?
size of the film passing over the intake sensor
Which part of fixer solution shrinks and preserves the emulsion?
What is the highest acceptable base + fog reading?
Name three reasons a film would come out of the automatic processor still wet?
insufficient washing, insufficient drying, improper fixing
How often should the processor be evaluated?
Name the parts of the developer solution.
Reducing agent, activator, preservative, restrainer, solvent
Name three causes of an increase in base + fog.
Failure to add starter when mixing fresh chemicals, increased developer temperature, outdated film
What causes crescent marks on the film?
bending the film
What is a sensitometer?
A device that prints a standard gray scale
Can chemical fumes cause an increase in base + fog?
Which part of the developer solution softens the film emulsion of the film?
Which step in the film processing cycle creates the black portions of the image?
What causes static artifacts?
Not enough humidity in the air
What is the functions of the fixer in film processing?
To remove the unexposed silver halide crystals and harden the emulsion
Exposed silver halide crystals are changed into black metallic silver by what?
The reducing agent in the developer
What causes white marks on a film?
dirt in the cassette
What is restrainer?
Prevents chemical fog in new developer
How do abrasions occur?
When films rub against any surface
What prevents oxidation of the developer?
What is a kiss mark?
When 2 films come in contact during development
Why is the water tank drained nightly?
To prevent algae growth
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