[pure-silver] Re: Selenium toning + Agfa Sistan

Thanks Ralph,

This is how I thought Sistan works but I've had a doubt while reading their 
documentation (sorry, I
found it in german only):
http://www.agfaphoto.com/de/photo/pdf/products/Sistan_Broschuere_2003_D.pdf
and particularly on page 4:
--------------------------------------------------------------------
"Ausfallende" Wirkung mit Schutzmantel.
Durch die Behandlung mit Agfa SISTAN wird das sich durch
Oxidation bildende Silbersalz als farblose, unlösliche
Silberverbindung ausgefällt.
Diese neu entstandene, vorteilhafte Sibersalzverbindung ist
lichtunempfindlich, sehr stabil und umhüllt das Silberkorn wie
ein Schutzmantel.
Für hohe Archivfestigkeit und eine Stabilität, die fast
den Konservierungsgrad einer Schwefeltonung erreicht.
--------------------------------------------------------------------
It seems like, but maybe it's just my german which is very limited, Sistan 
creates a layer of silver
salts protecting the metallic silver.
And thus my question, will it create this layer if the metallic silver is 
already covered with
selenium ?

I hope you're right, Sistan looks like a very convenient solution to protect 
prints without
modifying their aspect (or prints toned with toners not very archival).

Best regards,
Claudio Bonavolta
http://www.bonavolta.ch
----- Original Message ----- 
From: "DarkroomMagic" <info@xxxxxxxxxxxxxxxx>
To: "PureSilverNew" <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, November 25, 2004 1:11 AM
Subject: [pure-silver] Re: Selenium toning + Agfa Sistan


> Claudio
>
> Think of selenium and sulfide as creating 'protective layers' of modified
> silver. Think of Sistan as a 'pollution sponge' added to the paper to be
> there 'just in case'. The function of Sistan is very different from that of
> toners but not unlike the function of calcium carbonate to 'buffer' mount
> boards to protect them from potential pollution attacks in the future. Use
> it in addition to toning prints, not as a replacement.
>
>
>
>
>
> Regards
>
>
>
> Ralph W. Lambrecht
>
>
>
>
> On 11/25/04 12:30 AM, "Claudio Bonavolta" <claudio@xxxxxxxxxxxx> wrote:
>
> > Dear All,
> >
> > I like light (1+19) selenium toning because of the increased Dmax it gives 
> > to
> > the prints without a
> > important change of color (well, with Ilford MG FB).
> > As it seems selenium toning with this concentration is no more the panacea 
> > to
> > keep our prints alive,
> > will an additional bath of Agfa Sistan help in any way ?
> > Or, in other words, can Sistan still make the protective layer once there 
> > is a
> > layer of selenium ?
> >
> > Thanks,
> > Claudio Bonavolta
> > http://www.bonavolta.ch
> >
> >
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