upon the chemical process to produce visible and
permanent images. An important requirement for
optimum photographic processing is the careful and
correct preparation of photographic solutions. Improper
can have far-reaching effects on operations, quality,
production, and mission accomplishment in the imaging
facilities of the Navy. It is often difficult to determine
the cause of poor quality when improper chemical
production and wastes money.
prints, and this requires photographic chemistry. It may
be your job to ensure that all chemicals needed are
that you cannot take lightly." A solution that is mixed
must use the utmost precautions when mixing, checking,
or analyzing the photographic solutions used in your lab.
dated to show either the date received or the date
shipped. This helps provide proper stock rotation and
systematic control of chemical usage. Chemicals should
well-ventilated storage area where the temperature is
maintained at or about 75°F with a relative humidity of
about 40 percent.
a n d c o n t a m i n a t i o n . W h e n t h e f o l l o w i n g
recommendations are adhered to, most "unused"
bottles are best for developer and developer replenisher.
Screw caps must be free of corrosion, foreign particles,
cardboard inserts, and be airtight. Never interchange
bottle tops from one bottle to another. A cap-to-bottle
color or number code is suggested.
is removed. Since this increases the chance for
oxidation, store solutions in small bottles instead. The
entire contents of a small bottle can then be used at one
time. However, a small air space should be left even in
small bottles. This allows for varying solution volume
due to temperature changes and keeps the cap from
loosening or the bottle from bursting.
protect the solutions from aerial oxidation Dust covers
also should be used to cover the top of the tank. The tank,
the lid, and the cap should be coded in such a way that
they are reassembled with the correct parts.
packaged with the chemicals. Do not use chemicals that
have been in storage too long.
discoloration. Each solution has its own "signature" or
characteristic appearance; and any change from normal
may be a sign that it will produce unsatisfactory results.
Check both sides and the bottom of the tank for
precipitates. If there are any, carefully stir the solution
to redissolve them. When you are unsure of the quality
of the solution, discard it.
chemical stability or keeping qualities, both on the shelf
before mixing and as prepared solutions. After
long-term storage, chemicals may lose some of their
Basic Photography Course