Drying film for too short or too long aperiod, or at too
high or low a temperature will cause size variations of the
material. This can be a significant cause of fit problems with
No matter how much you squeegee a film, it will still bring
moisture into the drier. If you put a large number of sheets
through in quick succession, you can raise the relative
humidity of the air inside the drier. This means that you may
have to increase the drying temperature to maintain film size.
Processing single sheets will require a lower drier temperature
than when processing many sheets in quick succession
This may be important If you are producing work to very fine
tolerances. Because of this potential problem, never overload
the processor's drier beyond the limit at which it can disperse
Most companies processing large amounts of
film install some form of silver recovery This allows
the recovered silver to be sold to specialist companies and in
some cases, the fixer to be reused. If silver is recovered with
an electrolytic process, do not reuse the fixer without adding
an equal amount of fresh solution.
If the system utilises wire wool type pads to attract the
silver, never use the remaining solution because the wire wool
will have deposited iron into it during the process.