[pure-silver] Re: Old Kodak Projection paper :
- From: "Breukel, C. (HKG)" <C.Breukel@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 31 Jan 2005 11:48:39 +0100
Hi Barrie,
I too obtained several folders of ancient Kodagraph paper size 11 3/4 * =
16 1/2, type C13, can even be processed under subdued tungsten light! =
As you can imagine it was extremly slow but I managed to enlarge on it., =
but I obtained no grey-tones only pure black 9or white), I even tried =
Lith printing, and now e are talking reakly slow here, exposures in the =
15-25 minutes, even with a 250 watt opal tungsten lamp in my Laborator =
L1200 (almost frying it..), but I stil did not obtain mid tones, the =
lith effect showed through deep bLack shadows (with quite some =
infectious development, and a pinkish coloured "highlights")
good luck,
Cor
> -----Original Message-----
> From: pure-silver-bounce@xxxxxxxxxxxxx
> [mailto:pure-silver-bounce@xxxxxxxxxxxxx]On Behalf Of Barrie Bunning
> Sent: Friday, January 28, 2005 8:08 PM
> To: pure-silver@xxxxxxxxxxxxx
> Subject: [pure-silver] Re: Old Kodak Projection paper :=20
>=20
>=20
> Greetings all;
> I have a few questions for the group :-
> I have recently come buy 2 unopened packets of '=20
> Kodak Kodagraph PRQ5 projection paper, it says on the label=20
> one of a=20
> range of Kodak Document materials. It is Rough single weight,=20
> use Wratten=20
> series OB safelight, made in England.
> Q1. What color is Wratten OB ?
> Q2. What developer to use.
> Q3. What was the 'Original purpose' of this paper.
> I have opened up one packet, in the dark, and my standard=20
> safelight seems=20
> OK, the paper has a really rough texture, is reasonably slow=20
> to enlarge=20
> with but seems to be similar to Grade 2. My test images=20
> are lovely, but=20
> the paper is really thin and the base color is a little=20
> pinkish, but nice.=20
> I have yet to try toning. Any Info would be greatly=20
> appreciated as I have=20
> 98 sheets of 20" x 16" paper that seems to be in excellent=20
> condition for=20
> its age ? .
> Cheers Barrie B.
>=20
> At 04:01 PM 27/01/2005, you wrote:
>=20
> >----- Original Message -----
> >From: <anclancy@xxxxxxxxxxx>
> >To: <pure-silver@xxxxxxxxxxxxx>
> >Sent: Wednesday, January 26, 2005 8:39 PM
> >Subject: [pure-silver] Re: Selenium toning question, was
> >stopbath kills fixer
> >
> >
> > > there is no need to just tone 4 11x14 and toss. it is not
> > > good for the environment, and the selenium is still good.
> > > as it begins to slow down, just add some selenium to the
> > > mixture and continue to use.
> > >
> > > I haven't read the directions in a long time, so i can't
> > > comment of the number of prints per ounce, but as many
> > > others, i continue to use the toner, adding as needed. The
> > > last time i topped off a 1:10 ratio was last year some
> > > time, and i tone frequently. Don't remember the last time
> > > the other ratios have had to had additional selenium
> > > added.
> > >
> > > The directions also, indicate that one can mix the
> > > selenium with HCA, which is no longer considered a wise
> > > and necessary directions.
> > >
> > >
> > > regards,
> > > ann
> >
> > The capacity of KRST depends on the material being toned
> >and on the nature of the images. Low key images take up more
> >selenium from the toner so the capacity is less than for
> >high key. The capicity is pretty much judged by the length
> >of time it takes the toner to work. If it gets too slow add
> >more concentrate as you recommend.
> > The use of Kodak Hypo Clearing Agent as a diluent was
> >suggested by Kodak only when the toner was highly diluted,
> >say 1:20, as was previously recommended for image
> >protection. The reason is that the bath then acted as a
> >combination of toner and wash aid. KRST at 1:20 seems no
> >longer to be a good protectant although the slight
> >intensifying action may be desirable for its own sake. At
> >this dilution the capacity of both toner and wash aid is
> >similar. For stronger dilutions its recommended that the
> >tone be diluted in plain water and the wash aid used
> >separately first. The reason is to avoid the possibility of
> >staining due to precipitation of elemental Selenium on the
> >print due to its being acid. I doubt if this is a serious
> >problem for prints or film that has been washed. Since KRST
> >contains a fairly large amount of Ammonium thiosulfate
> >prints can be toned directly from the toner, the hypo does
> >not affect the toner. Its possible that the acid might
> >result in staining from the above reason but I am uncertain
> >if this happens.
> > Note that Kodak at one time recommended KRST diluted 1:9
> >as a test for residual silver halide in place of the older
> >Sodium sulfide test. This test works on well washed material
> >but fails if there is an excess of hypo. I have never seen
> >an explanation of the chemistry behind this. As a test for
> >completeness of fixing KRST has the advantage over Sulfide
> >of being odor free and being more stable in storage.
> >
> >---
> >Richard Knoppow
> >Los Angeles, CA, USA
> >dickburk@xxxxxxxxxxxxx
> >
> =
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> --------------------------------------------------------------
> -----------------------------------------
> barrieb@xxxxxxxxxxxxxxxxxxxx{ Melbourne , Australia } =20
>=20
> =
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> =
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