WHAT EQUIPMENT AND MATERIALS ARE NEEDED ?
With the exception of an electronic densitometer, the equipment
and materials required to monitor your process are relatively
simple and inexpensive. These materials are used primarily
for reference or for recording information about your process.
They include:
- Operator's checklist for
your processor
- Maintenance checklist for
your processor
- Processing log
- Process monitoring information
.
- Process Record Form ( for
example Kodak's Y-55 form.)
- Instruction sheet for your
processing chemicals
- A set of red, green, and
blue pencils
- Electronic color densitometer
- Reference control strip
and control strip.
WHAT
CAN BE DONE ABOUT AN OUT-OF-CONTROL PROCESS ?
First verify the problem. A
problem may have been indicated because of operator error,
such as processing a control strip at the wrong temperature,
using a control strip of a different code number, or incorrectly
recording the densitometer readings. If the problem is verified,
then you must determine the cause. The best indication of
the problem will be the plot of the control strip readings.
See Diagnostic charts for your particular process . Once the
diagnosis is properly made, you must correct whatever caused
the out-of-control condition. The steps you take to correct
an out-of-control process will depend on the cause. Causes
such as incorrect time, temperature, or agitation can usually
be corrected quickly by restoring the process or processor
to the correct condition. Out-of-control conditions resulting
from improper solution mixing, storage, keeping, replenishment,
or contaminated solutions usually require that the tank solution
be replaced. Again, your process monitoring manual is a source
of information on how to correct a particular problem.
WHAT
OTHER CONTROL METHODS ARE HELPFUL?
There are several simple methods
which are available for checking the condition of your processing
solutions and equipment to make sure that they are within
operating specifications. These methods use simple equipment
and require little training. They include methods for:
- Calibrating flowmeters and
pumps
- Calibrating mixing tanks
- Checking for mixing errors
- Checking the densitometer
calibration .
REVIEW-HOW
DOES A COLOR PROCESS WORK ?
Photographic color films and
papers contain several emulsion layers. A minimum of three
are required: one sensitive to blue light, one sensitive to
green light, and one sensitive to red light. Other emulsion
and filter layers may be required depending on the type of
film or paper. Most color films and papers have the dye forming
chemicals incorporated in the emulsion. Chemical reactions
during development determine the color produced in the individual
layers. Other processing stages are required to remove chemicals
and chemical by-products not used in forming the image and
to stabilize the image. These are usually done in the bleach,
fixer, stabilizer, and wash stages.
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