bag with seal and gradually
restore to. room temp. by placing in a refrigerator for several hours
before opening seal.
Compensation for
reciprocity failure
It is suggested that for exposures longer than quarter of a second
that a 5G filter be used and exposure extended by one third.
Colour Dev. exercises a subtle effect on colour
balance, adjustment should be by using solutions of Potassium. Hydroxide
and Sulfuric Acid even when processing a small number of films and the pH
is below the lower limit, to maintain the values given in table.
As the colour Dev. is highly
alkaline, it will absorb the carbon dioxide (C02) present in the air to
reduce the pH, so that the preventive measures such as the use of full
bottles, should be taken to prevent the solution from oxidation of the
chemicals by air.
First
Developer pH 9~55 — 9.6
First Developer
pH 9.55 - 9.60
Bleach pH
5.62 - 5.64
Colour Developer
pH 1. 68 - 11.82
Fixer pH 6.50 - 6.66
Standard Processing Steps
First
Dev
38.5 +/-
0.36
101.3 +/-
0.5F
6 minutes.
Total Dark
Wash.
33.5 +/-
39C
92
to 102F
2 “
Reversal, 33
to
39C
92
to 102F
2 “
Colour Dev.
33.5 +/-
0.6 C
97.7 to
1.1F
6 “
Normal
Room
Conditioner,
33
to 39C
92
to 102F
2 “
light
Bleach. 33
to 39C
92
to 102F
6 “
“.
Fixer.
33
to 39C
92 to
102F
4 “
“
Final Wash.
33
to 39C
92
to 102F
4 “
“
Stabilizer. 33
to 39C
92
to 102F
1 “
“
Dry
35
to 45C
95
to 113F
-
“
Establishing
Processing Conditions
1. Processing procedures
which has most effect on quality of film is First Dev to be followed by
Colour Dev Consequently the temperature for 1st Dev. & Colour Dev.
must be controlled within a high degree of accuracy to +/- 03C’
(0 5F) for 1st Dev. and +/- 0.6c (1•1F) for Colour Dev of the
standard temperatures.
2. The standard processing time is. from the moment
the film enters the solutions until the moment it enters the next
processing solution. The establishing each processing time, care to be
taken that they never are less than those specified.
3. As agitation effects
speed, colour balance, uneven processing results, this should always be
carried out uniformly. Processing conditions are established with
standards and time, and basically carried out while adjusting agitation
conditions. When processing is by loading the film onto a spiraI reel, the
method of agitation given below should be followed.
First & Colour Developer.
A. During initial 15 seconds, immerse the reel into solution and
simultaneously knock it 4 or 5 times to remove bubbles
adhearing to film. After this raise the reel completely from the solution
and immerse it once more. repeat this performance 5 times.
B. After leaving reel still for 15 sees, stir continually by
raising/lowering it once every second.
C. Seperate from the solution 10 sees before the specified time.
Other processing solutions, excluding Wash
.
A. During the first 15 sees, draw out the
reel completely from the solution and then re-immerse, repeating this 5
times.
B. Leave it still for, 45
sees, after which draw out the reel completely from the solution,
leave at a slant for 5 sees to drain and immerse it once more. This should
be carried out once a minute, and solutions draining operation started ten
sees before specified time.
NOTE
Where a lid is used on the processing tank and instructions say raise the
reel, use the complete tank inversion method instead.
Washing:
During the first 15 secs, raise the reel completely out of the water and
re-immerse and repeat this 5 times, after which let it lie still. Drain
then refill the tank every minute.
Filters should
be fitted to the recirculating system for washing water in order to
prevent intrusion, accumulation of precipitates etc in the solution and
washing water. The fuse of a metal core filter should be. Absolutely
avoided. An average filter mesh of around 25 microns for processing
solutions and 20 to 50microns for water use, will be most suitable. If the
Final wash is insufficient, It will affect dye stability.
Drying:-
A drying temperature of 35C. and 40C. will be the most appropriate,
if drying is done at too high a temperature and too rapidly, curling will
occur and in addition uneven drying will result. If the temperature is too
low, the film may become sticky with poor dye stability. The first Washing
procedure not only stops the reaction of the 1st Dev. but also prevents
the Reversal bath (if used) from contamination with 1st Dev. Contamination
will greatly affect the colour Balance.