"Geoffrey S. Mendelson" <gsm@[EMAIL PROTECTED]
> wrote in message
news:slrnfluu1q.u90.gsm@[EMAIL PROTECTED]
> Richard Knoppow wrote:
>> new prints and tone them as suggested above. The toning
>> will
>> protect the prints against even pretty severe oxidative
>> attack.
>
> Having similar problems with early digital prints, we got
> into
> the habit of spraying them with a fixative designed for
> art work.
>
> Would this work?
>
> Geoff.
>
At one time it was recommended that prints be coated
with laquer, in fact, Kodak used to sell print laquer.
However, although it may protect surfaces from contact with
air this is not always effective since oxidizing material
can reach the print through the sup****t plus the coating
makes it difficult if not impossible to treat the print
should that become necessary.
In the case of RC prints it was found that covering the
prints caused a trapping of the g***** emitted by the
reflective layer. This may no longer be the case for paper
containing the scavengers and anti-oxidants but is still not
recommended.
Remember that the digital images are composed of dyes or
pigments, not metallic silver. It may be that laquer would
be suitable for color prints were the images are composed of
dyes.
The best protection for silver prints is to tone them.
I did not mention in my other post the use of protective
agents such as Agfa Sistan or Fuji Ag-Guard. The Agfa
products is discontinued but may still be found and, AFAIK,
Fuji does not sell Ag-Guard outside of Japan. They are not
identical but both use substances which are supposed to
stabilize the image without having any effect on its
appearance. Fuji released some research on its product
indicating it was effective but less so than toning. AFAIK,
there was never any serious research done for Sistan
although there is anecdotal evidence that it works. However,
Sistan is sensitive to the amount left in the emulsion, too
much results in staining.
--
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Richard Knoppow
Los Angeles, CA, USA
dickburk@[EMAIL PROTECTED]
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