Re: Modifying bleaches

From: Ryuji Suzuki ^lt;>
Date: 11/29/04-12:12:01 PM Z
Message-id: <>

From: MARTINM <>
Subject: Re: Modifying bleaches
Date: Mon, 29 Nov 2004 18:46:25 +0100

> You probably know you can convert any silver chloride emulsion into
> a silver bromide or silver iodide emulsion by simply bathing the
> silver chloride emulsion in a potassium bromide or potassium iodide
> solution. A silver bromide emulsion can be converted into a silver
> iodide solution by using a potassium iodide solution.

Since you brought this up outside the context of silver gelatin
emulsion making, I thought to point out that this doesn't work in
finished emulsions. More specifically, this halide conversion does not
work once stabilizing agents that work as a ripening retarder is
added. Before adding stabilizer, it works. I routinely make
chlorobromide emulsions this way - make 100% AgCl first and then
convert certain mole fraction into AgBr. Then ripen, digest and

Ryuji Suzuki
"People seldom do what they believe in.  They do what is convenient,
then repent." (Bob Dylan, Brownsville Girl, 1986)
Received on Mon Nov 29 12:12:14 2004

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