From: Clay (wcharmon@wt.net)
Date: 04/10/03-11:55:48 AM Z
I can answer that. It lasts almost forever, just like the other metal salts.
Clay
----- Original Message -----
From: "Manuel Gomes Teixeira" <punctumgt@netvisao.pt>
To: <alt-photo-process-l@skyway.usask.ca>
Sent: Thursday, April 10, 2003 12:50 PM
Subject: Re: hp and pot di with pt/pd
> Kerik,
>
> Thank very much indeed for the precious help you are providing to me.
> Your information will be vital for a correct volume order I will complete
> today from B&S.
>
> My last question:
>
> What is the shelf life of NA2 solution ?
>
>
> Thanks again for your time. :-)
>
>
>
> Kindest regards
>
> > From: Kerik <Kerik@kerik.com>
> > Reply-To: alt-photo-process-l@sask.usask.ca
> > Date: Thu, 10 Apr 2003 10:18:47 -0700
> > To: alt-photo-process-l@sask.usask.ca
> > Subject: Re: hp and pot di with pt/pd
> >
> > Manuel,
> >
> > Two drops of the standard Na2 solution (20%) would give a *radical*
> > increase in contrast. This stuff is very powerful. I suggest you dilute
> > some of your Na2 with distilled water into 10% and 5% batches, then do
some
> > experiments adding just one drop to your normal sensitizer mix and see
what
> > you get at each concentration level. You don't need to substitute from
your
> > standard mix, just add a drop of Na2.
> >
> > Kerik
> >
> >
> >> And with Na2 , do you use it as direct substitute for K2ptCl4 ?
> >>
> >> For example
> >>
> >> 9 drops FeOx
> >> 1 " Pt 2 " Na2
> >> 6 " Pd
> >> to increase contrast , instead of
> >>
> >> 9 drops FeOx
> >> 3 " Pt
> >> 6 " Pd
> >
> >
>
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