[pure-silver] Re: Problems with KRST????


----- 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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