[pure-silver] Re: Viradon vs KBT
- From: john stockdale <j.sto@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Wed, 03 Nov 2004 05:25:20 +1100
If the pH of the toner affects the toning, maybe instead of straight sodium
sulphite (which is what I use), the lower pH from KHCA (sulphite plus some
bisulphite) might be better as a "toner stop".
With "old" Viradon, I used to rebottle working strength Viradon to later
reuse. This seems not to be feasible with new Viradon due to precipitate
which I assume is elemental sulphur.
John S
==========================
At 01:29 AM 3/11/2004, you wrote:
>-----Original Message-----
>From: DarkroomMagic <info@xxxxxxxxxxxxxxxx>
>Sent: Nov 2, 2004 5:53 AM
>To: PureSilverNew <pure-silver@xxxxxxxxxxxxx>
>Subject: [pure-silver] Viradon vs KBT
>
>I recently switched to Agfa Viradon New, because it was easier to obtain and
>I ran out of Kodak Brown Toner. Yikes, they are more different than I
>remember from the old Viradon.
>
>Viradon New (1+24) seems to 'stick' to the FB print. The yellow 'skin'
>washes off fairly rapidly, but this never happened with KBT. Also, a white
>solid deposit develops rapidly to a much heavier extend than with KBT. Worst
>of all, Viradon after-tones quite heavily in the final wash in spite of a
>2-minute treatment in HCA.
>
>I ended up changing the dilution to 1+48 and toned for not much more than 45
>seconds. The MG-IV prints are still clearly toned. I'm concerned to dilute
>it further and the after-toning is had to control.
>
>Any experiences to be shared?
>
>
>
>
>
>Regards
>
>
>
>Ralph W. Lambrecht
>
>
>
> It would be interesting to know _exactly_ what is in these two toners.
> The MSDS for KBT is not very enlightening. T-7 has Liver of Sulfur and
> sodium carbonate in it. I don't know what the function of the carbonate
> is since Liver of Sulfur will tone on its own or with other alkalies. It
> may be that the pH has an effect on the staining.
> Polysulfide toners have the curious property of toning faster as they
> are diluted or exhausted. When very dilute they can leave a peach colored
> stain in the highlights.
> If you are using KHCA diluted 1: 4 as for treating film or prints its
> not strong enough, the instructions for the sulfite "stop bath" specify a
> 10% solution. KHCA _stock_ is about this strength. If you are using the
> diluted wash aid the stock wash aid may help. Also, a less diluted
> Viradon bath might be more controllable. At least worth trying on a small
> scale.
>
>
>
>Richard Knoppow
>dickburk@xxxxxxxxxxxxx
>Los Angeles, CA, USA
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