Steve Shapiro (sgshiya@redshift.com)
Mon, 25 Jan 1999 18:40:56 -0800
Steve Anchell's "Darkroom Cookbook" shows a formula for redevelopment,
Amidol Redevelopment formula; and I wanted to know if a bleach
composite/formula is necessary. What is the simplest bleach formula for
redevelopment, anybody know?
S. Shapiro
sgshiya@redshift.com
-----Original Message-----
From: Sil Horwitz <silh@iag.net>
To: alt-photo-process-l@skyway.usask.ca
<alt-photo-process-l@skyway.usask.ca>
Date: Sunday, January 24, 1999 3:32 PM
Subject: Re: Pyro redevelopment
>At 10:11 AM 1999/01/24 -0400, Sandy King wrote:
>
>>>This still doesn't explain Sandy's results. As a matter of interest,
Sandy,
>>>why is there bromide in your bleach?
>>
>>Quite frankly I don't know exactly what the bromide does but it is
>>recommended in the formula of several super proportional reducers that I
>>have on hand. I am going to assume that its primary function is to
restrain
>>the heavier silver deposits and reduce overall density, but this is only
>>speculation.
>
>In most bleaches, there is an oxidizer to produce a reactive silver ion,
>and a receptor (like bromide) to combine with the ion immediately to form
>silver halide (silver bromide if there are bromide ions present). Silver
>halides, of course, can then either be dissolved in fixer, or made to
>further react with another substance (as is done in toning).
>
>Sil Horwitz, FPSA
>Technical Editor, PSA Journal
>silh@iag.net
>Visit http://www.psa-photo.org/
>Personal page: http://www.iag.net/~silh/
>
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