[pure-silver] Re: Chromogenic toning?
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: "'pure-silver@xxxxxxxxxxxxx'" <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 21 Jan 2005 17:02:07 -0500
Based solely on the two molecular weights CD-3 (436.52) and CD-4 (292.34) you
should use 2/3 the given amount rather than half. Now, CD-3 might be faster
acting accounting for the difference in amounts. You would have to do some
testing.
Jerry
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
On Behalf Of Don Feinberg
Sent: Friday, January 21, 2005 3:51 PM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Chromogenic toning?
I've found it impossible in the last few months to get CD-3. Only CD-4 seems to
be available. Some advice given to me was to substitute CD-4 in CD-3 recipes
using half quantity.
Does anyone have anything more substansive?
Thanks.
Don Feinberg
ducque@xxxxxxxxxxxxxx
>
> >
> > Color Developer
> >
> > Kodak CD-1 .............................. 2.5 g
> > Sodium sulfite (anhy) ................... 2.5 g
> > Sodium carbonate (anhy) ................. 15.0 g
> > Potassium thiocyanate, 10% .............. 10.0 ml
> > Color coupler ........................... 5.0 ml
> > Water to make ........................... 1.0 l
> >
> > The developer can be made up beforehand and should keep for about a
month.
> > The coupler should be added immediately before use.
> >
> > The print is bleached in any rehalogenizing bleach and redeveloped
> > in
the
> > above color
> > developer. After development the print should be bleached again and
fixed.
> >
> > Encyclopedia of Photography, Focal Press 1962.
> >
> > The resulting prints are essentially color prints and like them must
> > be protected from exposure to direct sunlight. You could use any of
> > the
other
> > color developing agents CD-2, CD-3, CD-4.
> >
> > You could also probably use the developer from the Kodak RA-4 color
print
> > process by adding the coupling agent just before use. You would
> > have to experiment.
> >
> > This technology is essentially what was used in the old Kodachrome
process.
>
>
> I've got CD-4 in the house so that's okay. Would using sodium
> thiocyanate cause problems? The cost is about 1/4 the potassium.
>
> Looks like I'd just have to find the colour couplers.
>
> Thanks this looks much more do able.
>
> Nick
>
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