[pure-silver] Re: Chemical Fogging in Reversal Processing
- From: John Banister <jbanister@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 15 Aug 2006 01:45:34 -0400
Thanks for that information and for pointing out that thread.
A fellow had recommended anhydrous stannous chloride to me
in the past but also gave me the impression I'd have to source
it from shops that electroplate tin. It's good to know that I can
simply purchase a Kodak product instead. I should check at APUG
more often, but my memories of having done so are always associated
with a feeling of information overload that makes me tend to postpone
my visits there until I have a big chunk of time available. The big chunks
have been scarce recently.
John
> Funny you should ask now. There has been a rather lengthy thread on
> APUG on chemical fogging for reversal. The only important points are
> these. Kodak now uses a separate bath for this purpose for E-6 rather
> than doing it during the second development as they did for the E-4
> process. This bath consists of stannous chloride in a buffered acidic
> solution of propionic acid. This bath is used before the second
> developer after a wash to remove any remaining tin salt. There is no
> reason why this bath cannot be used for B&W reversal. I would be
> tempted to just buy this product as it is ~ $13 for enough concentrate
> to make 5 gal of bath.
>
> Jerry
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