specified by the manufacturer.
under ideal conditions. High temperatures and high
relative humidity accelerate this deterioration. You
should protect light-sensitive materials from the
harmful effects of temperature, humidity, x rays, gases,
and vapors that may be present in darkrooms, transport,
and adverse storage conditions. Storage instructions are
printed on the packaging materials of most photographic
relative humidity (RH). Keep these materials in their
original packaging until you are ready to use them.
When the RH gets at 60 percent or higher for long
periods of time, not only do cardboard packages, labels,
fungus, and bacteria start to grow. Fungi can destroy
film and paper by digesting the gelatin in them. Ideally,
film and paper should be stored below 50 percent RH.
deteriorate more rapidly than black-and-white
materials, and black-and-white materials with
high-speed emulsions deteriorate more rapidly than
black-and-white materials with slow-speed emulsions.
refrigerators and freezers that contain food or unsealed
containers of liquids have a high relative humidity.
Therefore, food should never be stored in the same
refrigerator as film and paper.
package. All film, including amateur film, must be
materials in extreme heat, such as in a glove
compartment, trunk, or the back window of a car. Once
opened, the original package should be used as soon as
possible. After opening, the materials are no longer
protected from humidity or chemical fumes.
on the film or paper. The warm-up time for
light-sensitive material depends on the type of material
packaging, the size of the package, and the amount of
packaged in larger quantities, 100 to 500 sheets per box
and in rolls up to 1,000 feet long. Short roll film and
magazines take 1 to 1 1/2 hours to warm-up. Large
packages and rolls of film and paper should be allowed
to warm-up to room temperature overnight or about 10
date for best results. If the film has not been used by this
date, it should be tested photographically to confirm and
determine its adjusted film speed and performance.
has, in fact, expired. When not subjected to adverse
storage and handling conditions, the film is probably
still usable for a reasonable time. You should consider
the expiration date as a guide only.
earliest expiration date should be used first. One
exception to this is when you know that a material of the
to improper storage conditions; for example, if film or
paper has been sitting on a pallet on the flight ramp in
Diego Garcia for several weeks before being delivered
Film and paper stored under unfavorable conditions or
film that has expired may have a loss of emulsion speed,
undesirable contrast changes, stains, color shifts, or high
Basic Photography Course