[pure-silver] Re: Chemical Blues
- From: Laurence Cuffe <cuffe@xxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 01 Feb 2009 18:17:13 -0500
Three thoughts here,
1) I know the color of the developer looks off, but have you tried using it? As
a sometime chemist we were told not to read too much into the color of a
reaction product as that can be more a result of highly absorbing, but minor
contaminants than the main chemistry involved.
2) As I understand it, the uncommon developing agent in the Edwal FG-7
developer was/is Chlorohydroquinone (2-chloro-1,4-dihydroxybenzene) AKA
"Adurol" (CAS:615-67-8). This is a developing agent which has also been
recommended for holographic and Nuclear emulsions. I don't think its usage in
these applications is necessarily based on any property in which it out
performs all other developing agents, but is more likely to result from early
scientists in these fields looking up old textbooks to find out about
photography and using the information they found there. It was more common as a
developing agent in the early days of photography.
3) Richards underlying point is probably quite valid, which is that there is a
whole subculture of silver bullet developers with astonishing and unique
properties extolled in the photographic literature by their aficionados, few
if any of which provide results which are significantly different from the
widely available industry standards.
All the best
Larry Cuffe
p.s. As a general note Anchell and Troops books on this area are a good read
and while they do contain errors, they provide a good framework for thinking
about this whole area and reasons for choosing one class of a developer over
another.
On Sunday, February 01, 2009, at 04:01PM, "Adrienne Moumin"
<photowonder2010@xxxxxxxxxxx> wrote:
>
>Thank you all so much for insight and suggestions...and for restoring my
>sanity on the google results! Thought I'd really gone thru some door back
>there!
>
>I will contact BKA tomorrow, and hopefully will get a quick resolution to this
>thing!
>
>Thanks to all,Adrienne*************************************** on the web at:
>www.picturexhibit.com more work @ Saatchi Gallery: www.tinyurl.com/hw6r3
>handmade jewelry:
>www.droolerystore.com***************************************
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