[pure-silver] Fixers and Image Color... (was something esle)
- From: Ray Rogers <earthsoda@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Mon, 18 May 2009 09:54:08 -0700 (PDT)
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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