[Alt-photo] Re: Was Sulfamic Argyrotype and toning

[Don Sweet]

Hi Loris

Is there any way to get those gold deposits back into solution?

Don Sweet

----- Original Message ----- 
From: "Loris Medici" <mail at loris.medici.name>
To: "The alternative photographic processes mailing list"
<alt-photo-process-list at lists.altphotolist.org>
Sent: Thursday, May 16, 2013 1:49 AM
Subject: [Alt-photo] Re: Was Sulfamic Argyrotype and toning


> Hi Sandy, I agree for Vandykes (same results here, since the beginning),
> but I yet have to manage to get fully blue-black (from highlights to
> shadows) gold toned prints with Argyrotype, the deepest shadows remain
very
> slightly warm against the mid tones and highlights... Perhaps it due the
> addition of glycerin to the stock solution, do you add glycerin?
>
> The shelf life / stability of the toner is good but can't be considered
> stable; I haven't used toner older than 3 months, I mix 1000-2000ml small
> batches... I do it that way since I saw gold deposits on the sides of the
> bottle that was sitting around 5-6 months. (Maybe it started to deposit
> earlier - I can't be sure, it was waiting my attention in the closet...)
> OTOH, my gold salt is different than what you all use; I don't have access
> to straight gold chloride (can't buy it locally) therefore I use locally
> avaiable potassium tetrachloroaurate.
>
> Regards,
> Loris.
>
>
> 2013/5/15 Sandy King <sanking at clemson.edu>
> >
> > Loris,
> >
> > If you tone a vandyke or argyrotype print to completion with a gold
> thiourea
> > toner the deepest shadows should have a distinctive bluish-black color.
If
> > the tone that remains is slightly reddish/magenta/purplish the toner has
> not
> > done its job. The toner may be weak, or you might need to use more of
it.
> >
> > I have noticed that some of the my batches of gold thioura toner do not
> > seem to work as effectively  as in the past and have wondered what could
> > be the cause. It would seem that the gold chloride, distilled water and
> salt
> > would remain stable, wonder if the chemical thiourea goes bad?
> >
> > Sandy
> >
> >
> > On May 15, 2013, at 3:50 AM, Loris Medici wrote:
> >
> > > Hi Marek they look nice, thanks for sharing. The result with gold
toner
> > > look very much like what I get; somehow, you can't totally neutralize
> the
> > > warmth in the deepest shadows - a very dark and slight reddish /
magenta
> > > tint remains...
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