I remember him saying that the problem seems to be
greater with recent prints. When prints are set aside
for a couple of months before framing, the problem is
somehow reduced. Maybe some sort of acid environment
is created between the glass and the print?
Herbet.
--- William Johnson <[EMAIL PROTECTED]> wrote:
> >That makes me feel better, as I've given out a
> bunch
> >of RC prints in the
> >last year or 2...luckily they were all toned.
>
> >BTW, how did Ctein test?
>
> >tv
> Hi,
>
> He basically says that he took a print, toned half
> in
> selenium, and the diagonal half in Sistan, which
> gave
> him four quadrants: untoned, selenium only, sistan
> only, and selenium and sistan. He archivally
> mounted
> the print and put it in a frame, placed the frame in
> a
> well lit (but not direct sun) part of his house.
> Within 6-8 months, the untoned portion of the AGFA
> print was "silvering out", and about a year for
> Kodak.
>
> He goes on to say that after two years, the
> untreated
> quadrants were deteriorating badly, while there was
> no
> visible change in any of the toned quadrants.
>
> He goes on further to do experiment with an untoned
> print, cut in half, where he takes one quadrant,
> places it in frame, and leaves the other half
> outside
> of the frame. He sealed the frame off with archival
> tape to separate the two quadrants atmospherically.
> He did this to both halves of the print (two frames)
> and hung one in the light, and covered one with a
> black cloth on
> the same wall. After 9 months, the section inside
> of
> the frame hung in the light, was silvering out.
> After
> two years, the section outside of the frame in the
> light, and the two quadrants that were covered with
> the black cloth showed no deterioration.
>
> He concludes that something in the print itself,
> when
> untoned, and placed in a relatively airtight
> container
> (frame) and exposed to normal amounts if
> illumination
> causes the breakdown.
>
> Thanks,
>
> William in Utah.
>
>
>
>
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