[pure-silver] Re: Fixers and Image Colour... (was something esle)
- From: <C.Breukel@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 19 May 2009 09:00:33 +0200
Hi Ray,
I can only assume that the fixers "produce" slightly differently shaped silver
filaments just like some toners (well more bleach/redevelop like FSA aka
thiourea "toner" does). And these filaments reflect the light differently
resulting in different colours, which are quite apperant.
But I guess you are much more knowledgable than me in these matters..
Best,
Cor
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx [mailto:pure-silver-
> bounce@xxxxxxxxxxxxx] On Behalf Of Ray Rogers
> Sent: maandag 18 mei 2009 18:54
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Fixers and Image Color... (was something esle)
>
>
> COR,
>
> That is interesting.
> Any idea what is going on?
> How are the different fixers creating the different colors?
> Have you seen any discussion of this somewhere?
>
> Richard,
> <<please check your mail box!>>
>
> Ray
>
>
> --- On Mon, 5/18/09, Richard Knoppow <dickburk@xxxxxxxxxxxxx> wrote:
>
> > From: Richard Knoppow <dickburk@xxxxxxxxxxxxx>
> > Subject: [pure-silver] Re: AW: Re: toxicity
> > To: pure-silver@xxxxxxxxxxxxx
> > Date: Monday, May 18, 2009, 3:51 PM
> >
> > ----- Original Message ----- From: <C.Breukel@xxxxxxx>
> > To: <pure-silver@xxxxxxxxxxxxx>
> > Sent: Monday, May 18, 2009 1:33 AM
> > Subject: [pure-silver] Re: AW: Re: toxicity
> >
> >
> > Well, there is still an area were the use of KCN fixer is
> > still very
> > much alive..the Wet Plate Collodion shooters like me.
> >
> > I myself never wanted to get involved in using KCN as a
> > fixer, I use
> > ordinairy Ammoinium thiosulphate fix, but there are still
> > quite a few
> > practisioners who use KCN. I did not hear stories about
> > difficulties in
> > obtaining KCN, oddly enough I might add, the stuff aint
> > nice,
> > espescially if you are so dumb to mix it with the acid
> > developer,
> > releasing deadly HCN gas..
> >
> > The reason for KCNB fix (other than historic) is that the
> > resulting
> > colour of the ambrotype (collodion negative on glass with a
> > black
> > backing turning it in a positive again) is influenced by
> > the fixer; KCN;
> > warm creamy, AmmThio: Sepia; SoubiumThio: neutral..
> >
> > Best,
> >
> > Cor
> >
> > A problem with wet plate is that the silver
> > halide is mostly silver iodide which is resistant to fixing.
> > Ammonium thiosulfate is a better fixer for it than sodium
> > thiosulfate but KCN is the most effective of all. A problem
> > with KCN is that it tends to bleach out metallic silver as
> > well. Thiosulfates take longer than KCN but are essentially
> > non-toxic while KCN is very hazardous.
> > KCN was also often used as the fixer when an
> > iodine bleach was used but thiocarbamide or ammonium
> > thiosufate works as well if given a bit more time. Iodide
> > reducer or bleach does not leave yellow stains as
> > ferricyande often does (but not if its fixed adequately).
> >
> > --
> > Richard Knoppow
> > Los Angeles, CA, USA
> > dickburk@xxxxxxxxxxxxx
>
>
>
>
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