[pure-silver] Re: Problems with KRST????
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Thu, 10 Apr 2008 02:37:56 -0700
----- Original Message -----
From: <C.Breukel@xxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Thursday, April 10, 2008 1:20 AM
Subject: [pure-silver] Re: Problems with KRST????
Hi Bogdan,
You told us that you fixed your prints with acetic acid
instead of fixer (did you not smell that?).
What I do not get is why the prints did not change coluor
rapidly if they weren't fixed at all? Or does acid give a
temporarly "fix" ? (I seem to recall a quick non-stable
printing system, Richard?)
Best,
Cor
I suspect the acid inactivated the developer so that the
prints did not blacken quickly. However, they would discolor
within a short time.
The process you are thinking of was called the
stabilization process. This was a early "rapid access"
method using fiber base paper which delivered reasonably
stable images without the usual fixing and washing step.
After development (and maybe a stop bath) the prints were
treated in a stabilizer bath. I don't remember all the
chemicals which could be used for stabilizing but one common
one was sodium thiocyanate. After stabilizing the prints
were dried. The reason for using fiber paper was that there
was a reservoir of the stabilizer in the support. The prints
were not permanent but would not discolor for perhaps some
months and could be made permanent by subsequent fixing and
washing.
This system was supplanted by the use of RC paper in
roller transport processors where the total processing time,
including fixing in a rapid fixer, and a wash, was no longer
than the stabilizing process and resulted in relatively
permanent prints.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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