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A-1671 December 2001 4
For Table Top Processors*
Mix the brown toner solution at a dilution of
1:25 (1 part brown toner to 25 parts water).
The temperature of the brown toner solution
should be 100
0
F. If the machine speed varies,
adjust it to allow for a minimum of 25 seconds
of dwell time in the brown toner solution.
As an example, the tank setup for a Kodak Prostar
Processor is the following:
Tank Solution
1 Brown Toner
2 Brown Toner
3 Brown Toner
4 Brown Toner
5 Wash
6 Wash
For this particular application, a constant machine
speed of 10 feet/min yields a dwell time in the
brown toner solution (all four tanks) of 24-25
seconds.
*These are starting point recommendations.
Final conditions will vary.
Procedure to Ensure Post-Processing
Brown Toning
To ensure that the brown toner solution has
changed the processed silver to silver sulfide,
follow this procedure.
After the post-process brown toner treatment has
been completed, measure the background density
(or D-max) of an image of a plain white document
on the microfilm. Bleach a portion of the microfilm
that contains the filmed white documents with
dichromate bleach, wash thoroughly, and dry the
microfilm. Re-measure the background density (or
D-max) of the white document. If 65% or more of
the density remains, the brown toning is sufficient.
This procedure is outlined in ANSI/NAPM IT9.15-
1993.
5
Dichromate bleach is available by ordering the
following from Solutek (1-617-445-5335):
Part Number Description Quantity
P/N 413-24 Microfilm 4 per case; in
Bleach and 1 gallon bottles
Replenisher
Conclusion
Kodak Brown Toner, using the procedures
described above, has been shown to meet ANSI
specifications for satisfactorily toned film as
described in ANSI/NAPM IT 9.15-1993.
5
All films
toned at the Kodak Disaster Recovery Laboratory
will be done in accordance with these procedures
and standards. ANSI/NAPM IT 9.1-1996 (ANSI/ISO
10602-1995)
6
recognizes that microfilms given
stabilizing treatments as described here are
expected to achieve their full Life Expectancy (LE)
of 500 years for polyester-based and 100 years
for acetate-based films. If you have questions
about brown toning, please call your local Kodak
Representative or the Kodak Disaster Recovery
Laboratory at 1-800-EKC-TEST (1-800-352-8378)
or 716-253-3907.