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Re: Formidine sulphinic acid toner?
On Sat, 4 Mar 2000, Darlington Media Group wrote:
> ... You can use any one of a
> number of bleaches that converts your image to the bromide, chloride or
> even iodide and re-develop the image in a solution of f.s.a. that has been
> made alkaline with sodium carbonate or hydroxide. The pH of the f.s.a.
> solution and the choice of bleach and paper are the factors which govern
> the colours/tones of the final image, which can range from blue/black
> through red brown to even yellow/green. Unlike most indirect toners, there
> is no loss of image density during this process. In fact, the image is
> intensified.
Tony, do you happen to know what the archival qualities of an image thus
toned are? I was uncertain about that, because it was still silver. I did
find I could selenium tone afterwards if it wasn't plated, not much change
of color, but presumably more archival-- but I didn't have a clear idea of
the actual chemistry at work.
However, it occurs to me to mention in the light of your comments above,
that this toner can be a wonderful way to get beeyutiful brown tones
without stinky sulfides-- tho, as noted, in my experience it's slow.
Judy
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| Judy Seigel, Editor >
| World Journal of Post-Factory Photography > "HOW-TO and WHY"
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| <http://rmp.opusis.com/postfactory/postfactory.html>
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