Charles Walters (CWalters@ColoradoCollege.edu)
Thu, 27 May 1999 23:53:54 -0600
Paul, see asterisks below--might be of interest:
Charles Walters
Darkroom Supervisor
The Colorado College Art Department
(719) 389-6369
FAX (719) 389-6882
cwalters@coloradocollege.edu
> ----------
> From: Judy Seigel
> Reply To: alt-photo-process-l@sask.usask.ca
> Sent: Tuesday, May 25, 1999 7:41 PM
> To: alt-photo-process-l@sask.usask.ca
> Subject: Re: Nelson's Gold Toner, further notes
>
>
>
> On Wed, 26 May 1999, Liam Lawless wrote:
>
> CUT
>
> > HYPO-ALUM-GOLD SEPIA METHOD
>
> CUT
>
> >
> > Still doesn't exactly say why to fix (apart from "checking" toning), but
> > hope that helps. One other thought occurs to me: I don't know if there
> > actually is any hypo in hypo-alum, because it may be that all the
> sulphur is
> > precipitated from it, in which case it probably doesn't have any fixing
> > properties. When toning with gold, there is some conversion of silver
> to
> > silver chloride which, it could be, remains after hypo-alum toning.
>
>
> You know a thought occurs to me -- a much simpler explanation of why to
> refix after toning than the ones we've been reaching for...
>
> When talking about *archival* processing and why to use *fresh fix*, the
> literature says that *used fix* has those subcomplexes of silver, that do
> not wash out readily EXCEPT in fresh fixer. In fact I've read that once
> they dry in the print they're almost impossible to wash out -- which is to
> say, you can't dry your prints and THEN give an archival wash at some more
> convenient time.
>
*******************comment above
> So if your toning bath has got "hypo" in it, and has had a couple of
> prints through it, it is by definition USED fix, would have those
> subcomplexes and need FRESH FIX to archivally wash...
>
> > As a matter of interest, the same book gives a Gevaert recipe (GT2)
> which is
> > also stated to give warmer tones than the plain hypo-alum formula (GT1),
> but
> > using lead nitrate instead of gold.
>
> The Malinkrodt book also has some sweet photos of spilled chemicals, which
> of course they didn't see the way we see them today -- they meant to show
> off their lily white powders. We see, uh oh, a pile of chemicals in the
> air ! (Autres temps.....)
>
> Lead nitrate makes some fine bleaches, lead acetate too. (We're not
> drinking it, you know.)
>
> cheers,
>
> Judy
>
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