Re: Modifying bleaches

"More specifically, this halide conversion does not
work once stabilizing agents that work as a ripening retarder is
added. Before adding stabilizer, it works."

It may depend on the specific stabilizer - since conversion to silver iodide
can be carried out routinely on commercial ultra-fine grain (and supposedly
stabilized) silver bromide emulsions.

Martin

----- Original Message -----
From: "Ryuji Suzuki" <rs@silvergrain.org>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Monday, November 29, 2004 7:12 PM
Subject: Re: Modifying bleaches

> From: MARTINM <martinm@SoftHome.net>
> 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
> stabilize.
> --
> Ryuji Suzuki
> "People seldom do what they believe in. They do what is convenient,
> then repent." (Bob Dylan, Brownsville Girl, 1986)
Received on Tue Nov 30 08:02:19 2004