[pure-silver] Re: Chemical Fogging in Reversal Processing
- From: John Banister <jbanister@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 15 Aug 2006 01:46:17 -0400
Thanks very much for your words. Thiourea sounds like an interesting avenue
to explore. It also sounds like I can hope to approach B&W reversal
without strange
unexpected pitfalls if I do a little studying and experimentation, and that's
comforting to know.
John
> Hi John,
>
> I don't think that the science of chemical fogging for B&W
reversal has advanced too
> much since Grant Haist wrote his book, but there may be
"variations on a theme".
>
> For what it's worth, I do chemical fogging with an alkaline
thiourea bath (the "odourless"
> version of an alkaline sodium sulfide bath). It works quite well.
The image tone depends
> (to some extent) on the alkalinity of the toning bath as well as
on the grain structure of
> the film (in my hands, TMX gives a sickly yellow colour, while
Pan-F+ gives nice
> chocolate brown tones).
>
> Jordan
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