[pure-silver] Re: Testing Washing with Selenium Toner 1+9
- From: Elias_Roustom <elroustom@xxxxxxxxx>
- To: pure-silver@xxxxxxxxxxxxx
- Date: Tue, 26 Oct 2010 21:28:57 -0400
Thanks Richard. I wet the print by running water over the corner I was testing.
This was a practice print to test several things at once including a new
washing routine... so I'm not worried about the stains.
Residual silver? So that's testing for sufficient fixing then?
So to test my washing, I need to get some sodium sulfide.
Elias
On Oct 26, 2010, at 7:57 PM, Richard Knoppow wrote:
>
> ----- Original Message ----- From: "Elias_Roustom" <elroustom@xxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Tuesday, October 26, 2010 2:36 PM
> Subject: [pure-silver] Testing Washing with Selenium Toner 1+9
>
>
> So I took a bit of selenium 1+9, dripped on my washed and dried sheet. In the
> first 1/2 hour, there was no color change, but the next day there was a
> bright orange sheet. Does that mean I didn't wash my print properly?
>
> Did you wash the print after testing with the toner? If not the toner
> decomposes and leaves some elemental selenium on the print giving an orange
> or peach-colored stain.
> The test solution is for residual silver, not residual thiousulfate and,
> in fact, may fail if there is a lot of hypo in the emulsion so it must be
> used on well washed material.
> A drop or two of the test solution is put on _wetted_ paper and left for
> about two minutes, then blotted off. There should not be any stain left. If
> the test is made on a print or negative rather than a scrap of film or paper
> the material should be washed as it would be after selenium toning.
> The procedure is the same for the original sodium sulfide test. The
> selenium solution is longer lasting than the sulfide solution and does not
> have the rotten egg odor of sulfide but the sulfide test works in the
> presense of hypo. I don't remember for certain but I think the sulfide test
> will leave a permenant stain even after washing so it should be made on a
> scrap that has been processed along with the material or made on a border
> area of a negative where a stain will not matter.
>
> --
> Richard Knoppow
> Los Angeles, CA, USA
> dickburk@xxxxxxxxxxxxx
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