[pure-silver] Re: Old Paper Developer Question
- From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 19 Feb 2008 05:22:04 -0800 (GMT-08:00)
-----Original Message-----
>From: C.Breukel@xxxxxxx
>Sent: Feb 19, 2008 12:07 AM
>To: pure-silver@xxxxxxxxxxxxx
>Subject: [pure-silver] Re: Old Paper Developer Question
>
>
>
>________________________________________
>From: pure-silver-bounce@xxxxxxxxxxxxx
>[mailto:pure-silver-bounce@xxxxxxxxxxxxx] On Behalf Of Don Sweet
>Sent: maandag 18 februari 2008 23:12
>To: pure-silver@xxxxxxxxxxxxx
>Subject: [pure-silver] Re: Old Paper Developer Question
>
>Thanks to everyone for those helpful replies.
>
>It looks as if amidol will be more trouble than it is worth.
>Chlorohydroquinone seems ideal, if any can be found at a reasonable price (and
>perhaps it needs hazmats shipping).
>Might glycin be the next best option?
>
>
>Regards
>Don Sweet
>
>..Don,
>
>Glycin is also expensive and unstable. It also has a limited shelflive. I
>believe that chlorhydroquinone was used by Kodak as a benchmark as a absolute
>fog free developer. Peopl on APUG claim to have obtained remarkebale results
>on old paper with it.
>
>And you could also use chlorhydroquinone as a developing agent on TechPan for
>some weird effects..;-)..
>
>See http://unblinkingeye.com/Articles/Yurow/yurow.html
>
>And also my little articele in one of the issues of Judy Seigal's PF Journal,
>
>Best,
>
>Cor
I reiterate that there is confusion here between fog generated by the
developer and fog due to aging of the emulsion or chemical effects on it. The
latter produces developable centers in the silver halide crystals just as if
they were exposed to light. The anti-foggants suppress these but AFAIK no
developer is inherently free of this kind of fog.
There are some developers which do not produce chemical fog and are
relatively immune to aerial fog. For instance, there are some developers used
in emulsion research but they are not very practical for pictorial purposes.
--
Richard Knoppow
dickburk@xxxxxxxxxxxxx
Los Angeles, CA, USA
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