Film processing

Question 1

Safe Lights inside dark rooms need to be:

Answer 1

o At least 4 feet from work area
o Proper bulb size - not to exceed 15 watts
o Covered by filter that only allows light of a spectral emission that is not within the sensitive
range of the film you’re using

Question 2

Film should not be exposed to “safe light” more than _ min-

Answer 2

3 minutes

Question 3

Manual processing:

Answer 3

developer 5 minutes @ 68 degrees; fixer for 10 minutes; drying 20-30 minutes

Question 4

Developer Activator

Answer 4

Sodium carbonate- Softens gelatin protective cover on film

Question 5

Developer Reducing Agents

Answer 5

Hydroquinone Reduces EXPOSED silver halide to black metallic silver

Question 6

Developer Preservative

Answer 6

Sodium sulfite

Question 7

Developer Restrainer

Answer 7

 Potassium bromide

 Acetic acid

Question 8

Automatic Developer systems:

Answer 8

o Higher temperatures (Dev. 92-96° F)
o Constant agitation of chemicals
o Rapid through-put of film (90-180 seconds)

Question 9

If you keep you processor running all due to not taking a lot of films , you machine requires what?

Answer 9

increased chem replenishment rates b/c the chems degrade more quickly when they are at higher temps just sitting there.

Question 10

under-replenishment cause loss of what?

Answer 10

contrast (gray appearing) and film density

Question 11

over-replenishment causes loss of what?

Answer 11

contrast (increased fog) and wastes chemicals

Question 12

Dark room causes of apparently lowered contrast on a film due to:

Answer 12

• safe light fog
• room temp/humidity too high
• chem fog from processor too hot
• chem fog from chems too concentrated
• film past exp date

Question 13

Complete chem change and tank cleaning and check replenisher rates and cycle time every…

Answer 13

two months