Film Processing Flashcards
What are the 4 cycles of film processing?
- Development
- Fixing
- Washing
- Drying
Film placement on entrance tray:
Which side of the film should be against the feed tray guide?
Short side of film
What should be the temperature for the developing cycle?
The developing cycle changes silver ions of the exposed crystals into what?
This changes the latent image into a ___ image or ___ image.
What does the wetting agent (water) do?
What does the developing agent do?
- Developing cycle temperature = 92-96°F
- Changes silver ions of the exposed crystals into black metallic silver
- ^^ changes latent image into a visible image or manifest image
- wetting agent = penetrates/opens up gelatin
- developing agent = turns silver ion crystals into black metallic silver
Developer:
Temperatures:
TOO high temperatures = ___ density
TOO low temperatures = ___ density
Length of Time:
TOO long = ___ density
TOO short = ___ density
Developer:
Temperatures:
TOO high temperatures = darker density
TOO low temperatures = lighter density
Length of Time:
TOO long = darker density
TOO short = lighter density
What happens during the fixing cycle?
Unexposed silver halide crystals are cleared off the film
a. clearing agent
b. hardeners are added to the fixer
What happens during the wash cycle?
(water): removes all chemical from the film
What does the dry cycle do?
Blows the film dry
a. wet reading
What are artifacts?
Unwanted density on a radiographic image
What are the 3 classifications of artifacts?
- Processing artifacts
- Exposure artifacts
- Handling and storage artifacts
PROCESSING ARTIFACTS
What is the curtain effect? What causes it?
What causes emulsion pick-off?
What are P1 lines? How often does it scratch?
What 2 types of fog makes film look gray?
PROCESSING ARTIFACTS
Curtain effect = top of film, density ok but lower film is too dark
Curtain effect cause = lower edge of film left in developer too long or processor was turned off
Emulsion pick-off cause = improper guide roller placement, dirty rollers, warped rollers
P1 lines = improper position of guide rollers
Scratches = every 3.14 inches (size of rollers)
Gray fog = chemical and safelight fog
EXPOSURE ARTIFACTS:
● -no ___ matching of the film and screens for the exposure.
● -poor film/screen ___ during the exposure.
● -___ exposure
● - ___
● -___ screens or grids
EXPOSURE ARTIFACTS:
● -no spectral matching of the film and screens for the exposure.
● -poor film/screen contact during the exposure.
● - double exposure
● - motion
● -warped screens or grids
HANDLING AND STORAGE ARTIFACTS:
● -___ fog
● -___ fog
● -___ electricity - “tree branches”
HANDLING AND STORAGE ARTIFACTS:
● -light fog
● -radiation fog
● -static electricity - “tree branches”
