"Richard Knoppow" <dickburk@[EMAIL PROTECTED]
> wrote in message
news:13luqei21tjc9c7@[EMAIL PROTECTED]
>
> "Jim Stewart" <jstewart@[EMAIL PROTECTED]
> wrote in message
> news:ktadnZwKuup4J8PanZ2dnUVZ_oKhnZ2d@[EMAIL PROTECTED]
>> I'm in trouble.
>>
>> I sent my mother-in-law a really nice B/W
>> print that I made and after about a year,
>> the black areas turned an ugly mottled gold
>> color.
>>
>> She wants a new print and I need to know
>> what to do so that the problem doesn't happen
>> again.
>>
>> I used Ilford chemistry and Mitsubi**** Gekko
>> paper.
>
> > toner. While it was found that Kodak Rapid Selenium
> > Toner,
> in very high dilutions, was not effective for microfilm a
> stronger dilution _is_ effective for pictorial films and
> prints where some change in image color or density is
> acceptable. According to Dr. Douglas Ni****mura, of the
> Image Permanence Institute of the Rochester Institute of
> Technology, a minimum of three minutes in a solution of
> 1:9 KRST will protect the image. Another very good toner
> is Kodak Brown Toner, a polysulfide toner.
I should have stated this more clearly. Tone in KRST at
a dilution no weaker than 1:9 for a time of not less than 3
minutes. This should give protection to all parts of the
print or negative. The problem with KRST is that it tends to
tone the more dense areas of the image more quickly than the
less dense parts. So, when toned according to the old
recommendations, that is, in a 1:19 solution for a couple of
minutes, as when combining KRST with a wash aid, the toning
is not sufficient to protect the shadow areas of negatives
or the highlight areas of prints. The high dilution method
was first suggested because it did not significantly change
the structure, density, or color of the image, im****tant
properties when toning microfilm but less im****tant to
pictorial film or prints. Toning according to the current
recommendation _will_ result in some change to the image as
will toning in KBT as suggested.
Toning of pictorial materials is less critical than
toning of microfilm so some restrictions which apply to the
latter do not apply to the materials we mostly use.
Again, gold toning is quite effective and does not cause
much change to the image appearance but the toners tend to
be expensive. Gold tends to generate a neutral to blue image
and, for this reason, may be desirable for some prints. In
general, the warmer toned the original image the more it
change in appearance in any toner, becoming more yellow in
sulfiding toners and more blue in gold toner.
However, the color is dependant on many factors, so, for
instance, microfilm does not become sepia colored in KBT but
rather ****fts toward blue.
--
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Richard Knoppow
Los Angeles, CA, USA
dickburk@[EMAIL PROTECTED]
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