[pure-silver] Re: Emulsion hardening for reversal processing of 35mm B&W film


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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