Processing Chemicals
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| What is the reducing agent in the developer? | hydroquinone and phenidone
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| Which reducing agent in the developer produces black and white? | hydroquinone
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| Which reducing agent in the developer produces grays? | phenidone
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| Name the activator in the developer that swells the gelatin and makes an alkaline pH? | sodium carbonate
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| Potassium Bromide | starter/antifoggant/restrainer in the developer; it decreases the activities of fresh chemicals
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| This preservative is a buffer that preserves original concentration of the chemicals? | sodium sulfite
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| Hardens the emulsion in the developer | gluteraldehyde
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| Solvent used in both the developer and fixer? | water - dissolves the chemicals
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| What are the four steps in film processing? | developer, fixer, washing, dryer
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| What is the total time of the film processing? | 90 seconds
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| What is the cleaning agent in the fixer? | Hypoammonium thiosulfate
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| What is the purpose of the cleaning agent in the fixer? | It removes silver halide crystals that were undeveloped and stops reduction
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| Acetic acid | activator found in the fixer and makes the acid pH and stops reduction
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| Gluteraldehyde is the hardener found in the fixer that hardens the emulsion. T/F | False - Potassium alum is the hardner in the fixer
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| What preservative is found in both the fixer and the developer? | sodium sulfite
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| What is the purpose of the replenishment tanks? | refills the developer and fixer tanks; 100-110 ml per 14" of film
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| What is the silver recovery unit? | mechanism to collect the silver
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| When is the image manifest? | In the developer due to hydroquinone (blacks and whites) and phenidone (produces grays)
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| It there is an ammonia smell what has happened? | mixture of chemicals
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| What is the purpose of the crossover rollers? | takes film from one tank to another
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| Scwegie rollers | takes excess chemicals off of film to prevent contamination
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| Purpose of splash guards. | prevent splashing and mixture of chemicals
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| What is the purpose of the silver recovery units? | economical and ecological
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| What are the two types of silver recovery units? | electrolytic and chemical
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| Aggitation upon imersion helps to produce ________. | uniform development
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| Why is the water kept at 5-7 degrees lower than the temp of the chemicals? | To stabilize the developer
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| Two purposes of the circulation system. | provides agitation and helps to mix the chemicals
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