[pure-silver] Re: Emulsion hardening for reversal processing of 35mm B&W film
- From: Jordan Wosnick <jwosnick@xxxxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Sun, 31 Oct 2004 11:25:12 -0500
Nick Zentena wrote:
> I think slime means alkaline.
It could be that the sliminess is being formed in the first
developer step, which is alkaline, but the bleach step itself is
acidic. I do know from Pat Gainer's observations that very strong
oxidizers (chlorine bleach, for example) will dissolve the
emulsion right off of the film.
> I think E-6 stabilizer is similar to C-41 stabilizer. Basically
> water,photo-flo and formaldehyde. The Formaldehyde slows/stops fading but
> it's not a hardner.
I have read elsewhere that formaldehyde has hardening functions
due to chemical cross-linking of the gelatin. I will double-check
that.
> Maybe a different bleach if you think that's the issue? Which formula
> are you
> using for this?
Permanganate acidified with sodium bisulfate. This is a fairly
standard B&W reversal bleach.
Jordan
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