Re: archival salt prints

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From: e n (emanmb@yahoo.com)
Date: 07/09/01-11:09:10 AM Z


--- Joe Portale <jportale@gci-net.com> wrote:
> The untoned salted paper picture is very fragile.
> You have raw silver
> halides in direct contact with the environment. An
> option would be to
> laquer the print to seal out the air. I do not know
> how this will effect the
> long term image stability. Although I have seen some
> salt prints from the
> 1860's that were laquered and they still looked
> pretty good. The color
> change in a photo image is the result of changes in
> the crystalin strucure
 
Also you can tone w/platinum a la the instructions in
Reilly's Albumen book. Probably a more dilute
formulation than stated for Albumen.

Eric Nelson
Chicago
> From: "Andre Fuhrmann"
> <Andre.Fuhrmann@uni-konstanz.de>
> To: <alt-photo-process-l@sask.usask.ca>
> Sent: Monday, July 09, 2001 7:49 AM
> Subject: Re: archival salt prints
>
>
> >At present I never toned my salt prints because I
> like their
> >characteristic reddish-brown colour, also if I know
> that without
> >gold toning they are not archival.
> >Now I am planning a new number of salt prints, and
> I would ask if
> >there is the way to achieve a better stability
> while retaining their
> >original colour.
> >Is there any experience in this matter?
> >
> >Alberto
>
> I also happen to like the rusty colour of untoned
> salt prints. Being
> archival is, of course a matter of degree. Frankly,
> I do not know
> how unstable untoned salt prints really are. From
> the fact that
> virtually all known salt prints of the classical
> period are toned one
> should by no means infer that the reason for toning
> was to achieve
> greater permanence. I have a sizeable collection of
> pre 20s
> photographic literature. The authors when giving
> recipes for toning
> _never_ discuss archival matters but only image
> colour. The rusty
> tone of "raw" salt prints was simply not approved of
> in those days.
> Of course, toning can improve permanence -- in
> particular, gold
> toning certainly does. But this is not to imply that
> untoned prints
> have no reasonable life expectancy. A necessary
> condition for
> reasonable stability is, of course, careful
> processing and storage.
>
> Instead of gold chloride you may want to try toning
> with selenium.
> At a dilution of 1 + 99 (e.g. Kodak Rapid Selenium
> Toner) you can
> tone for about 2 minutes without loosing too much
> density. The
> resulting image tone is somewhat closer to the raw
> tone than with
> gold chloride toner. But I do not know whether a
> toning bath at that
> dilution and for such a short time can enhance
> permanence.
>
> André
>
>

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