I use standard 3/32' glass, about 2.3 mm. As noted before I scrub the glass with cleaning powder (Comet here), rinse it with water and dry. It is important not to touch the glass with fingers to keep it clean. I am printing two test negatives that are not adjusted for carbon and as such the prints are not perfect, not much to show yet. I'll let everybody know once I have some nice work.
Marek
> Date: Tue, 11 Sep 2007 14:08:21 -0400
> From: sitgesn1@netscape.net
> Subject: Re: Carbon on glass
> To: alt-photo-process-l@usask.ca
>
>
>
> Marek,
>
> What's your glass thickness and do you need to prepare the surface of
> your glass?
>
> Can you show us any sample of your printings?
>
> greetings
>
> -Francesc
>
>
>
> -----Original Message-----
>
> From: Marek Matusz <marekmatusz@hotmail.com>
>
> To: alt-photo-process-l@usask.ca
>
> Sent: Tue, 11 Sep 2007 3:21 pm
>
> Subject: RE: Carbon on glass
>
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> Tom,
>
>
>
> Nice thing is there is no need to transfer. Since the exposure is from
> the back, the unexposed, unhardened gelatine sits on top of the image
> and dissolves nicely. The sharpness of the print is excellent despite
> the fact that the negative is separated from the image by a few
> milimiters. The trick is to us sun for exposure (or other collimated
> light source).
>
>
>
> Marek
>
>
>
> > Date: Sun, 9 Sep 2007 20:06:13 +0200
>
> > From: tsobota@teleline.es
>
> > Subject: Re: Carbon on glass
>
> > To: alt-photo-process-l@usask.ca
>
> >
>
> > Hi, Marek,
>
> >
>
> > I have used Sumi ink for transparent black with good results.
>
> >
>
> > Your idea of coating glass to get a tissueless carbon, so to speak,
> is
>
> > interesting, but I don't see very well the benefits over the usual
> way
>
> > of transporting exposed carbon tissue on a glass sheet. Do you get
> good
>
> > definition exposing from the back?
>
> >
>
> > Tom Sobota
>
> >
>
> >
>
> > Marek Matusz wrote:
>
> > > Thanks for the tip and the link. Sounds like very similar
> phenomenon as
>
> > > described in the dissertation. I will try my trusty Daniel SMith
> brand,
>
> > > but I guess powdered pigments are safest.
>
> > > Marek
>
> > >
>
> > >
>
> > >
> ------------------------------------------------------------------------
>
> > > Date: Sat, 8 Sep 2007 11:36:38 +0200
>
> > > From: halvor@ydl.net
>
> > > Subject: Re: Carbon on glass
>
> > > To: alt-photo-process-l@usask.ca
>
> > >
>
> > > Hi, yes .. Some watercolours contains ox gall wich can harden
>
> > > gelatine. Winsor & Newton is supposedly one case. I have only tried
>
> > > Holbeins which works fine.
>
> > >
>
> > > (problem is mentioned on page 65 in a thesis here
>
> > > _http://www.katayoundowlatshahi.com/research.php_ , there is a lot
>
> > > about carbon on glass in that thesis & very interesting images,
>
> > > recomended :-)
>
> > >
>
> > > Halvor
>
> > >
>
> > >
>
> > >
>
> > > On 9/7/07 5:48 PM, "Marek Matusz" <marekmatusz@hotmail.com> wrote:
>
> > >
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> > >
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> > >
>
> > > All,
>
> > > I need some help from carbon printers here. I have been
>
> > > experimenting with carbon on glass. My pigment was lamp black. I
>
> > > used back exposure of the glass plates in the sun and it all
>
> > > worked very nicely. It really seems so easy. I then decided i
>
> > > wanted a transparent black and made gelatine mix with perylene
>
> > > maroon and phtalo green ( this has been my favorite black for
>
> > > gum printing). It really gave a nice black gelatine solution. I
>
> > > coated a few glass plates, sensitized, exposed, but they were
>
> > > all insoluble, no image was formed. Something was not right, so
>
> > > I remelted the gelatine and covered some more pieces of glass,
>
> > > cut the dichromate and exposure, but with the same end result.
>
> > > The gelatine was insoluble and no image. AT this point I was at
>
> > > a total loss, so I tried a different batch of dichromate, but
>
> > > with same result. Finally I placed a dried, but unsensitized
>
> > > glass plate in hot water. To my surprize the dried gelatine mix
>
> > > would not redissolve in hot, hotter and very hot water. SOmehow
>
> > > one of the pigments or something else in the watercolour paint
>
> > > that I used as a pigment source made the gelatine totally
>
> > > insoluble once dried. I had an extra glop in the fridge and
>
> > > remelted it again and it melted fine.
>
> > > Has anybody seen that before? Are there some pigments that are
>
> > > not compatible for making carbon tissue? What do people used for
>
> > > transparent black?
>
> > > As a side comment I find that carbon on glass with back exposure
>
> > > (did I mention earlier that it is all back exposure) is
>
> > > relatively easy, much easier then gum. Gum does not stick to
>
> > > glass, so the glass needs to be treated, gelatine sticks to
>
> > > clean glass very nicely. It is also easier to coat with
>
> > > gelatine as it sets quickly and the plates can be moved from the
>
> > > flat surface.
>
> > > Marek
>
> > >
>
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> Can you find the hidden words? Take a break and play Seekadoo! Play
> now!=
>
>
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