1processing room ventilation
air changes:
8-10 per hour
exhaust fan
2processing room ventilation
air movement:
air inside the darkroom
15-25 ft/minute
fan
3processing room ventilation
storage room temperature:
10-21 degrees C or 50-70 degrees F
4darkroom temperature
20 degrees C or 67-83 degrees F (OLD)
18-24 degrees C or 65-85 degrees F (NEW)
5humidity for storage room and darkroom
40-60%
30-60% new for dr
6used to measure humidity
hydrometer
7to prevent the build up of fumes from chemicals
ventilation
8must be vented to the outside of the darkroom
air dryer
9ventilation provide constant flow of air between
60-70 degrees F
10humidity must be between
40-60%
11reduces contrast because of increased fog
greater than 60%
12static artifacts are possible to occur
less than 40%
13most important consideration in the selection of modern screen film
spectral matching/spectral absorption characteristics
14film sensitivity to various colors of light
spectral response
15rare earth screen was introduced in the
early 1970s
16rare earth screens are
fast screens
17rare earth screens emit
uv, blue, green, red
18calcium tungstate screens emit
blue and blue violet light
19made with rare earth elements - those with atomic number of _ to _
rare earth screen;57-71
20rare earth elements:
lanthanum, terbium, gadolinium