Re: Toning kallitypes and vandykes

From: Tom Micklin ^lt;>
Date: 11/14/05-02:01:37 PM Z
Message-id: <>

I solved my issues with not getting Kallitypes fully cleared by being fairly
aggressive with the agitation throughout the entire 4 minute clearing time.
I wonder if that might work with toning?
By the way, I didn't see this at all on APUG.

On 11/13/05, Sandy King <> wrote:
> I posted the following message over on <> but so
> far have gotten zero response. Hope someone here can offer some advice.
> Basically the situation is this. I interested the folks in photographic
> conservation at the Getty with the issue of toning kallitypes with pallaidum
> and platinum, specifically. Preliminary spectra analyis in their lab has
> confirmed that toning a kallitype (and I believe the same would apply to
> vandyke) with palladium or platinum results in replacement of the silver by
> the more noble metal, adding much permanence to the print.
> The toning formula used for the tests was 5 grams of 20% palladium
> chloride solution plus 5 grams of citric acid in one liter of water, and I
> did toned 5X7 test samples for 2.5, 5, 10 and 20 minutes, using just
> enough of the toner to cover the surface of the print in flat bottom tray.
> That turns out to be about 50ml of solution for a 5X7" print.
> What the tests showed was that the efficiency of toning in terms of the
> percentage of replacement of the silver with palladium is time dependent,
> i.e. a toning time of 20 minute results in a much higher percentage of
> replacement than toning for 5 minutes. This leads me to a question that I
> hope some of the chemists on the list might be able to answer. Does anyone
> have any idea how I might adjust the toning formula formula above to make it
> faster acting?
> Sandy

photography by tom micklin <>
Received on Mon Nov 14 14:08:14 2005

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