[pure-silver] Re: Chromogenic toning?
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: "'pure-silver@xxxxxxxxxxxxx'" <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 21 Jan 2005 11:34:21 -0500
Shouldn't make any difference using sodium thiocyanate. But to account for
different mol. wt. use only 8 ml instead of the 10 ml for the potassium salt.
Also to account for different mol wts use 2.8 g of CD-4 instead of the 2.5 for
the CD-1.
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
On Behalf Of Nick Zentena
Sent: Friday, January 21, 2005 10:54 AM
To: pure-silver@xxxxxxxxxxxxx
Subject: [pure-silver] Re: Chromogenic toning?
On January 21, 2005 10:10 am, Koch, Gerald wrote:
>
> 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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