[pure-silver] Re: RC to FB
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Fri, 31 Dec 2004 18:54:17 -0800
----- Original Message -----
From: "DarkroomMagic" <info@xxxxxxxxxxxxxxxx>
To: "PureSilverNew" <pure-silver@xxxxxxxxxxxxx>
Sent: Friday, December 31, 2004 4:57 PM
Subject: [pure-silver] Re: RC to FB
> Chris Woodhouse (on this list) did some tests, which show
> that alkaline
> fixer washes out a lot faster than acid fixer. However,
> I'm not sure what
> the trade-offs are.
>
>
>
>
>
> Regards
>
>
>
> Ralph W. Lambrecht
>
Such tests were done in the 1930's by Kodak labs although
a rather more extensive set of tests was done at Agfa by
Edyth Wyde. Kodak discovered that alum hardener had much
more effect than the fixer pH. For instance film fixed in
Chrome Alum (Potassium chromium sulfate) washed out as fast
as un-hardened film even though the pH of this fixer is
around 2.0.
I will repeat what I've put into a longer post, when a
sulfite wash aid is used the pH of the fixer has no effect
on wash rate.
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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