[pure-silver] Re: Chromogenic toning?
- From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
- To: "'pure-silver@xxxxxxxxxxxxx'" <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 21 Jan 2005 10:10:24 -0500
Here is some more information.
Color Couplers
--------------
Color Coupler Solvent
Concentration
--------------------------------------------------------------------------------
--
blue 1-naphthol alcohol 1 to 2%
blue 5-nitro-1-naphthol alcohol 1 to 2%
blue-green 2,4-dichloro-1-naphthol alcohol 1 to 2%
green pentabromo-naphthol alcohol 3%
pale green dichloro-ortho-cresol alcohol 2 to 3%
yellow 2,5-dichloro-acetoacetanilide alcohol or acetone 5%
yellow ortho-chloro-acetoacetanilide alcohol or acetone 5%
yellow-brown cyanoacetanilide alcohol or acetone 1%
orange benzoylacetanilide alcohol or acetone 5%
red 1,3-5-phenylmethylpyrazolone acetone 3 to 5%
magenta para-nitrophenyl acetonitrile alcohol or acetone 5 to 8%
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.
Jerry
-----Original Message-----
From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-bounce@xxxxxxxxxxxxx]
On Behalf Of Nick Zentena
Sent: Thursday, January 20, 2005 8:28 PM
To: 'pure-silver@xxxxxxxxxxxxx'
Subject: [pure-silver] Chromogenic toning?
Hi,
I've been reading "The Photographer's Toning book" and would like to try
chromogenic toning. But neither
p-Diethylaminoaniline sulphate
Sodium formaldehyde sulphoxylate
Are on the chemical list of my usual supplier. Can I sub something for these
two?
Looking at the rest of the formula it gets worse.
4-Nitrobenzyl cyanide
Acetoacet-2 5-dichloroanilide
2,4-dicloro-1-naphthol
1-naphthol
Should I give up or are these things easily available?
Thanks
Nick
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