[pure-silver] Re: [pure-silver]Farmer Reducer was: Re: Ansco 221 Observations & Questions
----- Original Message ----- From: <C.Breukel@xxxxxxx> 
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Monday, June 11, 2007 1:45 AM
Subject: [pure-silver] Re: [pure-silver]Farmer Reducer was: Re: Ansco 221 Observations & Questions 


Hi,
All this talk about bleaching made me wonder about the following: in the mentioned bleaches there is usual Potassiumferricyanide (KFCN) and a salt as PotassiumBromide, in order to convert the silver salt back to 
it's halide.
When you bleach with Farmer (KFCN and fixer) there is no salt present, so in what the silver atom is converted, into a silver-ferricyanide 
salt?

Best,

Cor
I am not sure of the chemistry. Evidently, the reducer converts the silver to something that hypo will remove but will not redevelop in a sulfide solution. The halide, of course, will also dissolve in hypo. 

---
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx 
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