[pure-silver] Re: Chromogenic toning?
- From: Nick Zentena <zentena@xxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Fri, 21 Jan 2005 10:54:24 -0500
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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