Richard Knoppow (dickburk@ix.netcom.com)
Tue, 25 May 1999 01:35:48 -0700
At 03:57 AM 5/25/99 -0400, you wrote:
>
>
>On Tue, 25 May 1999, Richard Knoppow wrote:
>> Nelson also states "Toning baths containing hhypo and alum and also baths
>> in which gold chloride was combined with these constituents have been known
>> for many years..." but gives no references to any. I know of the use of a
>> separate gold toning bath to modify previously sepia toned prints but do
>> not know of any other hypo-alum type toners which also contain gold
>> chloride. If anyone out there does I would be glad to have a reference
to it.
>> It is curious that his instructions say to return toned prints to the
>> fixing bath for five minutes. No rason is given for this. Kodak and Ansco
>> repeat this except that by the 1963 edition of Kodak's Processing Chemicals
>> and Formulas booklet this instruction has gotten lost. This is typical of
>> what happens when you get too far from original material.
>
>
>The theory for refixing, or one of them, is that some silver from the
>hypo-alum bath might lodge in the paper, and darken in time. By re-fixing
>that would be dissolved out.
>
>Judy
>
>
That makes sense. Both coventional hypo-alum and Nelson's have silver
dissolved in them and gain more when they are used.
----
Richard Knoppow
Los Angeles,Ca.
dickburk@ix.netcom.com
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