[pure-silver] Re: Direct toners- the Viradon mystery

Just to note, this effect is not limited to Viradon; this is a general
(poly)sulfide toner effect. I diluted KBT 1+500 once and got an obvious
yellow stain in the base within a minute, which would not wash out.





Regards



Ralph W. Lambrecht

http://www.darkroomagic.com







On 2005-06-27 14:40, "titrisol" <titrisol@xxxxxxxxx> wrote:

> Viradon has that strange characteristic, I believe Tim Rudman's
> toning book has a good explanation.
> The more diluted the Viradon the more it affects the highlights
> and the faster it works.
> 
> After toning, a quick rinse in water and a HCA bath (or sulfite
> solution) is reccomended as a stop for toning.  Works like
> magic.
> 
> 
> 
> --- Christopher Woodhouse <chris.woodhouse@xxxxxxxxxxxx> wrote:
> 
>> Until recently I have always used odorless sepia toners,
>> normally
>> indirectly, following a short bleach. Having seen some prints
>> of Ralph's I
>> thought I would try Viradon 'new' for the first time and was
>> amazed at how
>> it reacted in the wash. I know all that stuff about using a
>> Bisulphate stop
>> bath, but what I was wondering is it goes against everything I
>> thought I
>> knew about chemistry. I always thought that chemical activity
>> goes down with
>> lowered concentration. Watching through the side of my
>> archival washer, the
>> print continues to get browner and browner, changing even
>> after 20 minutes
>> gentle washing.
>> 
>> I'm intrigued, what is the mechanism that allows it to
>> continually change
>> colour when the concentration must be extremely dilute? I
>> thought for a
>> laugh I would put another print into extremely dilute Viradon
>> - nothing
>> seems to happen. What am I missing? (polite responses only!)
>> 
>> -- 
>> Regards Chris Woodhouse
>> 
>> 
>> 
>> 
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