Processing Chemistry Flashcards
Developing agents
Phenidone
Hydroquinone
Reducing agent; produces shades of gray rapidly
Phenidone
Reducing agent; produces black tones slowly
Hydroquinone
Helps swell gelatin; produces alkalinity; controls pH
Sodium carbonate
Antifog agent; protects unexposed crystals from chemical “attack”
Potassium bromide
Controls oxidation; maintains balance among developer components
Sodium sulfite
Controls emulsion swelling and enhances archival quality
Clutaraldehyde
Removes metallic impurities; stabilizes developing agent
Chelates
dissolves chemicals for use
Water
Developer
Phenidone
Hydroquinone
Sodium Carbonate
Potassium Bromide
Sodium Sulfite
Clutaraldehyde
Chelates
Water
Fixer
Acetic Acid
Ammonium thiosulfate
Potassium alum
Sodium sulfite
Acetate
Boric acids and salt
Water
Neutralizes the developer and stops its action
Acetic acid
Removes undeveloped silver bromine from emulsion
Ammonium thiosulfate
- Stiffens and shrinks emulsion
Potassium alum
Maintains proper PH
Acetate
- Removes aluminum ions
Boric acids and Salts
Swells the emulsion to permit subsequent chemical penetration
Wetting
Produces a visible image fron the latent image
Developing
Terminates development and removes excess chemical from the emulsion
Rinsing in stop bath
Removes remaining silver halide from emulsion and hardens gelatin
Fixing
Removes excess chemicals
Washing
Removes water and prepares radiograph for viewing
Drying
