LESSON 1
Fahrenheit, the film emulsion
swells
excessively, becomes
soft, and
is
easily damaged during handling.
b. With care, film can usually be processed without damage at
temperatures up to 80 degrees Fahrenheit. At such temperatures, however, it
is necessary to use special processing solutions and procedures.
c. At temperatures below 65 degrees Fahrenheit, there is no danger of
excessive swelling but the activity of the solution is slowed. This causes
the processing time to become inconveniently long, and there is danger of
incomplete action in development, fixing, and washing. Whenever possible,
solution temperature should kept between 68 degrees and 75 degrees
Fahrenheit.
d. There is a definite correlation between time and temperature as
shown on the sample time-temperature graph below. When it is impossible to
maintain solution temperature at the desired level, time can be shortened or
lengthened to compensate.
Example: Good results will be achieved with MICRODOL X at 10 minutes at 65
degrees Fahrenheit, and DK-50 (1:1) at 7 minutes at 65 degrees Fahrenheit.
Figure 1-8.
Time-temperature development graph
e. When the room temperature is within the suitable working range,
there aren't any temperature control problems. When the room temperature is
high, the solutions may be cooled
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