[pure-silver] Re: Potassium Bromide and chlorhydroquinone
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 8 Apr 2008 21:35:15 -0700
----- Original Message -----
From: "Don Sweet" <don@xxxxxxxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, April 08, 2008 7:51 PM
Subject: [pure-silver] Re: Potassium Bromide and
chlorhydroquinone
A few weeks ago there was a discussion on this list about
the possible use
of chlorhydroquinone as an anti-fogging developer for old
paper, if only you
could find some. Since then I have found there is a
recipe for "Maxim
Muir's Chlorhydroquinone-Substitute Developer" on page 174
of Carson Graves'
book The Elements of Black and White Printing (2ed), which
provides a
work-around for the chlorhydroquinone shortage if anyone
is interested.
Don Sweet
I have never seen anything in the scientific literature
on photography indicating that chlorhydroquinone had any fog
supressing effect. Some developing agents are better at not
creating developer fog than others without the use of fog
suppressants. In emulsion research non-organic metallic
developers are somtimes used for this reason but they are
not practical for general use. The fog in old paper comes
from other sources than the fog produced by a developer
without an anti-foggant. I would not bother to track down an
obscure and expensive chemical just to experiment with it.
Chlorhydroquinone was mostly used for warm tone
developers but is considered inferior to other reducing
agents which is why it was never much exploited.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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