D-32 September 2009
7
Before-process
handling and storage
Handling
Total safelight exposure, whether before or after image exposure, should not
exceed 30 minutes. For darkroom handling, 2468/3468 and 2470 Microfilms
should use a
Kodak
1 Safelight Filter / red or
Kodak
2 Safelight Filter / dark
red, in a suitable safelight lamp with a 15-watt bulb, located at least 4 feet (1.2
meters) from the film. Use a
Kodak
OA Safelight Filter /greenish yellow, with
the same lamp distance conditions for 2462 Microfilm. When using gooseneck
lamps with contact printers, a
Kodak
1 Safelight Filter / red is required.
Storage
For optimum life of Direct Duplicating Microfilms (2468/3468 and 2470), keep
unopened packages at 55°F (13°C), at 50 percent relative humidity or below,
and protected from radiation and x-rays. Film stored at higher temperatures or
humidities for a period of six months or more may lose photographic speed or
D-max. Duplicating Microfilm (2462) can be stored at 70°F (21°C) at 50
percent relative humidity or below, and protected from radiation and x-rays. To
avoid moisture condensation on film that has been refrigerated, allow cold film
to reach approximate room temperature before opening the package (about 3
hours if refrigerated, 5 hours if frozen).
After-process and
storage information
Image stability and keeping
These microfilms are manufactured to ANSI and ISO specifications for
extended term storage use. When processed as recommended, these
microfilms meet both ANSI and ISO specifications for microfilms intended for
long-term storage. These microfilms have a Life Expectancy LE-500 rating.
ISO 19801 2002, Photography — Processed Silver-Gelatin Type Black-and-
White Film — Specifications for Stability,
state that the maximum permissible
concentration of thiosulfate ion is 0.014 grams per square meter (1.4
micrograms per square centimeter). Thiosulfate limits for Class 1 grain apply
to this microfilm.
ANSI ISO 18911 2000, Photography — Processed Safety Photographic Films-
Storage Practices
, gives appropriate conditions for extended term (permanent)
and long-term storage films. Information is also available in
Kodak
Publication
D-31,
Storage and Preservation of Microfilms
. Extended term storage
conditions require a temperature of less that 70°F (21°C) and 20- to 50-
percent RH for polyester base microfilm.
These ANSI/ISO Standards can be obtained by contacting: Association for
Information and Image Management International (AIIM), 1100 Wayne
Avenue, Suite 1100, Silver Spring, MD 20910-5603, website: http://
www.ansi.org or by calling 301-587-8202.
NOTE: Refer to the latest revision of each ANSI or ISO Standard specified.
