Judy Seigel (jseigel@panix.com)
Tue, 25 May 1999 03:57:40 -0400 (EDT)
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
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