From: Steve Shapiro (sgshiya@redshift.com)
Date: 04/17/00-06:24:39 PM Z
----- Original Message -----
Subject: Re: AZO vs NEOVERA gaslight
>
>
> --- Steve Shapiro <sgshiya@redshift.com> wrote:
>
> The tonal values of green in the black colour may be
> due to the photographic printer using cold developers.
> When paper developer is used at a temperature below
> the recommended or colder than normal, it tends to
> make the black colour with a green, metal tint appear
> on the shadow levels of the photographic print.
> ...........
>
> Yes, that cold temperature developing could cause a
> change in tone, agrees in THEORY with what I have
> read, but do you know of a specfic reference where it
> says that GREEN tones are produced this way? Or was
> your comment only a personal observation? If so, with
> which paper/dev. combination and at what temp? In any
> case, green tones are usually obtained by other means.
>
> RM
>
>
This has the potential for a good thread.
In answer to your question, yes it was my own experience; but now being
pressed it was when printing with a multi grade paper, exposed using a low
gread.
That leads me to believe it is one typical result when using cold chemistry
on cloride based paper emulsions.
To completely answer your question. After my result, I researched it to
find it was a property of silver gelatin papers reacting to cold developers.
I can duplicate that, and did when wanting to produce this greenish, metal
tonality that tends to accentuate the shadow detail.
By accentuate, I mean it brings an attraction or luminosity by drawing the
eye into the shadows rather than toward highlights when printing for cold
tones found in bromide based silver gelatin papers.
I am personally attracted to the acutence in B&W prints, and to eliminate
dicroac (spelling?) fog when using Potassium bromide is a real trial and
error display of chemical to chemistry balance. It may all be easily
overcome by bleach and sepia toning. But, you will notice I am Not Michael
Kenna. :)
Steve Shapiro, Carmel, CA
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