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Exposure.20

Film Processing

QuestionAnswer
activator a chemical used in film developing in the fixer solution to maintain an acidic pH to enhance the funtioning of the clearing agent
agitatiot stirring up of the processing solutions
chemical fog the effect on a film when unexposed silver halides are reduced
chemical precipitation a type of silver recovery system that uses chemicals to break down in the fixer adn release electrons; the silver is heavy and falls to the bottom of the tank
circulation system a part of the automatic processing system designed to stabilize temperatures, agitate solutions, mix the chemistry, and filter the solutions
clearing agent the primary agent of the fixer
crossover network part of the automoatic processing transport system designed to bend the transport rack and must be directed down to the next tank or section
developing the step in film processing; silver is deposited at the latent image sites and an image becomes visible
drive system part of the automatic processing transport system designed as a series of mechanical devices to turn the numerous rollers in the processor from power supplied by a single motor
dryer system the final stage of film processing that removes the excess water, cools and dries the film, and seals the film for viewing and storage
drying the process of film developing in which hot air is forced over both sides of the film as it exits the processor
dwell time the time allotted for the fixer in a silver revcovery unit to sit to permit chemical reactions to occur
electrolytic a type of silver recovery system that passes a current from a cathode to an anode through the fixer; the ionized silver is attracted to the negatively charged cathode
entrance rollers specially designed crossover network to begin the film traveling form the feed tray down into the developer section
fixing the process of removing undeveloped silver halides to make the image premanent for viewing
flood replenishment a type of replenishing system used for low-volume systems; controlled by a timer that floods the developer and fixer tanks with replenisher at regular intervals
hardener a chemical used in film processing that controls the swelling of the gelatin to prevent scratches adn abrasions to the emulsion during processing; in a fixer solution must function in an acidic environment
heat exchanger the part of the automative processing system in which a thermostat is used to heat the developer which is then routed to a circulation coil to heat the fixer by conduction
hydroquinone a developing agent that slowly reduces silver and produces heavy density
metallic replacement a fixer recovery unit in which the fixer acid breaks down the iron in a steel screen or in steel wool and displaces it with silver
pass box a lightproof container set in the wall of the darkroom used to pass film through for processing
phenidone a chemical that quickly reduces silver, enhancing fine detail adn subtle shades of gray, and works only in areas of light exposure
preservative a chemical used in film processing to help descrease the oxidation of the reducing agents when they are combined with air; also used in fixer solution to aid removal of silver from the emulsion
reducing agent a chemical used in film developing that provides electrons to the silver ions attached to the sensitivity specks of the silver halide crystals
replenishment system replaces chemicals that are depleted through the chemical reactions of processing, oxidation, and evaporation
resin a type of silver recovery system that uses acid to form resin ions; the silver is attracted to the resin; the resin is processed to remove the silver
solvent chemicals used in developing film suspended in water
standby replenishment a type of flood replenishing system used for low-volume systems; controlled by a timer that floods the developer and fixer tanks with replenisher at regular intervals
starter solution a solution of acetic acid and potassium bromide that is added to the replenisher solution when starting a fresh tank of developer
superadditivity when two reducing agents are combined, forming a PQ developer, their reducing ability is the sum of their independent abilities
tailing if the silver recovery is not sufficient, a second process is undergone to process the solution after it has gone through the first unit
temperature control system the part of the automatic processing unit that maintains all theww solutions at compatible temperatures
timed replenishment a type of flood replenishing system used for low-volume sytems; controlled by a timer that floods the developer and fixer tanks with replenisher at regular intervals
transport racks part of the automatic processing transport system consisting of three rollers designed to move film through a processing tank
transport system paart of the automativ processing system designed to move a film through developer, fixer, wash, and dryer sections of the processor
volume replenishment type of replenishment system used for high-volume systems; activates when films enter the processor
washing the process of using water to remove as much of the fixer and developer solutions as possible
Created by: smweckler